If you just picked up a Samsung Galaxy A20, you’ve probably already tapped around and wondered what some of the icons actually do. The A20 menu isn’t complicated once you know where to look, but Samsung packs a lot into its settings panel, and a few of the most useful options sit a few taps deep.
This guide covers the entire A20 menu: how to open it, what each section controls, which settings matter most day to day, and a few hidden tricks most users never find.
What Is the A20 Menu?
The A20 menu is Samsung’s settings interface for the Galaxy A20, built on One UI, Samsung’s custom layer over Android. Instead of one long scrolling list, One UI organizes settings into labeled categories.
The Galaxy A20 launched in 2019 with Android 9 (Pie) and One UI 1, and later received an update to Android 11 with One UI 3.1 before Samsung ended official software support. The exact menu layout you see depends on which update your phone has installed, but the core structure stays consistent.
The A20 menu has three layers:
- Quick settings – the panel you swipe down from the top of the screen
- Main settings app – the full menu with all categories
- Hidden menus – service codes and diagnostic tools most users never touch
How to Access the Settings Menu on Galaxy A20
There are two ways to open it.
From the app drawer: Swipe up from the home screen and tap the gear-shaped Settings icon.
From the notification panel: Swipe down twice from the top of the screen, then tap the gear icon in the top-right corner.
Once inside, settings are grouped by category: Connections, Sounds and Vibration, Notifications, Display, and more. If you already know what you’re looking for, the search bar at the top of the settings menu is the fastest way in. Typing “battery” or “fingerprint” jumps straight to that setting instead of digging through menus.
Galaxy A20 Interface: How Settings Are Organized
One UI groups settings into these sections:
- Connections – Wi-Fi, mobile data, Bluetooth, NFC, airplane mode
- Sounds and vibration – ringtones, volume, vibration patterns
- Notifications – per-app notification control
- Display – brightness, font size, screen timeout, dark mode
- Wallpaper and themes – customization options
- Advanced features – gestures and shortcuts
- Device care – battery, storage, memory, security scans
- Apps – manage installed apps and permissions
- Lock screen – security options and screen lock type
- Biometrics and security – fingerprint, PIN, privacy settings
- Accounts and backup – Samsung and Google account management
- Accessibility – vision, hearing, and interaction settings
- Software update – checking for and installing updates
- About phone – model number, storage, software version
This structure is what makes One UI easier to navigate than stock Android for most people. Related settings sit together instead of being spread across separate screens.
Display Settings Worth Adjusting
The Galaxy A20 has a 6.4-inch HD+ Super AMOLED display, and the display settings let you adjust it well beyond brightness.
- Screen timeout – controls how long the screen stays on before locking. Shortening it to 30 seconds helps battery life.
- Font size and style – useful if text feels too small.
- Dark mode – easier on the eyes and can save some battery on the AMOLED panel, since dark pixels use less power.
- Screen resolution – on the A20 this is usually fixed at HD+; check Display > Screen resolution to confirm nothing’s been changed.
If the screen feels laggy or dim even at full brightness, it’s often a settings issue rather than a hardware problem.
Managing Apps and Notifications
To manage notifications per app: Settings > Notifications > select an app > toggle notifications on or off, or customize how they appear.
To manage app permissions and storage: Settings > Apps > select an app. From here you can force stop it, clear its cache, uninstall it, or review its permissions (camera, location, contacts).
If the A20 feels sluggish, go to Apps and sort by size to see what’s using storage. Clearing cached data for a few heavy apps, especially browsers and social apps, often frees up noticeable space without deleting anything important.
Battery and Performance Settings
Battery life is a common concern on the A20, especially as the phone ages. Li-Po batteries naturally lose capacity after a few years of daily charging.
Inside Device care > Battery:
- Power saving modes – Medium and Maximum, which limit background activity to stretch battery life
- App power management – puts rarely used apps to sleep so they stop draining battery in the background
- Battery usage graph – shows which apps used the most battery over the last 24 hours or 7 days
If the battery percentage drops unevenly, jumping from 20% straight to shutdown, that’s usually battery calibration drift, common after 18 months or more of regular use. It’s a hardware aging issue rather than something a settings change fixes, though power saving mode helps.
Security and Privacy Settings
The A20 menu includes a full set of security tools under Biometrics and Security, worth setting up properly even on a budget phone.
- Fingerprint recognition – the A20 uses a rear-mounted sensor and supports multiple registered fingerprints
- Face recognition – faster but less secure than fingerprint unlock
- Lock screen type – pattern, PIN, password, or biometric-only
- Find My Mobile – locate, lock, or wipe the phone remotely if it’s lost, as long as it’s linked to a Samsung account
- Secure Folder – an encrypted, separate space for sensitive apps or files, hidden from the main interface
Setting up fingerprint unlock and Find My Mobile takes about five minutes and is worth more than any other setting on this list.
Hidden Codes and Service Mode
Beyond the regular A20 menu, the phone has a diagnostic interface accessed through dialer codes. These aren’t secret in a restricted sense. Samsung built them in for testing hardware, but most users never come across them.
Open the Phone app and enter:
*#0*#– opens a hardware diagnostic menu to test the display, touchscreen, speaker, camera, sensors, and vibration individually*#06#– displays the IMEI number, useful for warranty checks or reporting a lost phone*#*#4636#*#*– opens phone information and battery/Wi-Fi details (may not work on every Android version of the A20)
The *#0*# diagnostic menu is safe to browse for checking your speaker or screen, but avoid changing settings you don’t recognize. Some options in service mode aren’t meant for everyday use and can affect calibration.
Customizing the Home Screen and Icons
- Themes – Settings > Wallpaper and themes > Themes offers free and paid packs that change icons, wallpapers, and system colors together
- Icon layout – long-press an empty spot on the home screen to adjust grid size, add or remove app pages, and place widgets
- App icon badges – toggle whether unread notifications show as a red dot on app icons
- Edge panels – if enabled, give quick access to favorite apps or contacts with a swipe from the screen edge
None of this is essential, but it’s the difference between a phone that feels generic and one set up the way you actually use it.
Connectivity Settings: Wi-Fi, Bluetooth and More
Under Connections:
- Wi-Fi – tap the gear icon next to a saved network to check its IP address, forget it, or set it as metered
- Bluetooth – pair headphones, speakers, or smartwatches
- Mobile networks – manage SIM settings, data usage, and network mode
- NFC (region dependent) – used for tap-to-pay and quick file sharing
- Mobile hotspot and tethering – share your data connection with another device
If Wi-Fi keeps dropping, go to Settings > Connections > Wi-Fi > Advanced and turn off “Wi-Fi Auto Reconnect,” then re-add the network manually. This resolves a surprisingly common complaint.
Common A20 Menu Problems and Fixes
App keeps crashing or freezing Settings > Apps > select the app > Storage > Clear Cache. If that doesn’t help, try Clear Data (this resets the app, so back up anything important first).
Battery drains unusually fast Check Device care > Battery to identify the responsible app, then restrict its background activity or uninstall it.
Settings menu is laggy or slow to open Common on older Android versions with limited RAM (the A20 ships with 3GB). Restarting the phone and keeping at least 2-3GB of storage free usually helps.
Notifications not showing up Check Settings > Notifications to confirm the app is toggled on, and check Device care > Battery > App power management, since sleeping apps often lose notification permissions silently.
Can’t find a setting that used to be there Software updates sometimes move settings to new locations. Use the search bar at the top of the settings menu instead of hunting manually.
Tips to Get More Out of Your Galaxy A20
- Restart the phone once a week to clear background processes
- Keep at least 10-15% of storage free; performance drops when storage is nearly full
- Use dark mode to ease the load on the AMOLED display
- Uninstall apps you don’t use, since even idle apps consume some background resources
- Check Software Update regularly under Settings > Software update. Official support has ended, but any remaining regional updates are still worth installing
FAQs
What is the A20 menu?
It’s the built-in settings interface on the Samsung Galaxy A20, running on One UI, where you manage display, battery, security, and connectivity.
How do I open the hidden menu on the Galaxy A20?
Open the Phone app and dial *#0*# for the hardware diagnostic menu, or *#06# to view the IMEI number.
Why is my Galaxy A20 settings menu running slowly?
Usually low free storage or too many background apps. Clearing cache and restarting the phone typically fixes it.
Does the Galaxy A20 still get software updates?
No. Samsung’s official support has ended, and the phone’s final major OS version was Android 11 with One UI 3.1.
How do I reset the Galaxy A20 to factory settings?
Go to Settings > General management > Reset > Factory data reset. Back up your data first, since this erases everything on the device.
Where is the battery percentage setting on the A20?
Settings > Notifications > Status bar, then toggle “Show battery percentage.”
Final Thoughts
The A20 menu is easier to navigate once you know how One UI organizes it. Everyday settings like battery, display, and notifications sit where you’d expect, and the hidden service menu is there if you ever need to dig deeper. A few minutes in the settings menu goes a long way toward keeping the Galaxy A20 running smoothly.
