If your Samsung Galaxy S23 screen is stuck in one orientation, the quickest thing to check is the auto-rotate toggle. Swipe down twice from the top of your screen to open the full Quick Settings panel. Look for the icon that says "Portrait" or has a circular arrow. Tap it once to change it to "Auto rotate". The icon should turn blue when it's active.
This is the most common fix, as it's easy to tap that icon by accident when pulling down the notification shade. I'd start here before trying anything more involved.
Enable Home Screen Rotation in One UI
By default, the S23's home screen doesn't rotate to landscape, even with auto-rotate on. This is a One UI design choice, not a bug. If you want your home screen and app drawer to rotate, you need to enable it separately.
Tap the text label "Portrait" or "Auto rotate" in your Quick Settings panel, not just the icon. This opens a small menu. Toggle on the switch for "Rotate to Landscape Mode" or "Home screen". Now, when you turn your phone sideways, your home screens should follow.
Restart Your Galaxy S23
A simple restart can clear out temporary software glitches that might be confusing the accelerometer. Just press and hold the Side key (power button) and the Volume Down button together until the power menu appears, then tap "Restart".
Wait for the phone to fully boot back up, then test the rotation in an app like YouTube or your camera. This takes less than a minute and often does the trick.
Perform a Force Restart
If a normal restart doesn't help, a force restart is the next step. This is slightly more thorough than a standard reboot. Press and hold the Volume Down button and the Side key for about 10 seconds.
You'll see the Samsung logo appear as the phone shuts down and starts back up. Release the buttons when you see the logo. This doesn't delete any data, it just gives the system a cleaner reset.
Boot Into Safe Mode
If the issue started after installing a new app, a third-party app could be interfering with the sensor. Booting into Safe Mode temporarily disables all downloaded apps so you can test.
Press and hold the Side key until the power off menu appears. Then, press and hold the "Power off" option on your screen. You'll get a prompt to reboot to Safe Mode. Tap it. If auto-rotate works perfectly in Safe Mode, you know a downloaded app is the cause.
You'll need to restart normally to exit Safe Mode, then uninstall recent apps one by one to find the culprit.
Update Your Software
Samsung has released several updates for the S23 that address various sensor and system bugs. Go to Settings > Software update > Download and install. If an update is available, install it and restart your phone.
This is especially worth checking if the problem appeared after a recent update, as a follow-up patch might be waiting to fix it.
Test the Sensors with Diagnostics
The S23 has a built-in diagnostic tool to check if the accelerometer and gyroscope are functioning. Open your Phone dialer and enter *#0*#. This opens the secret test menu.
Tap "Sensor". You'll see a screen with live data. Tilt and rotate your phone. The X, Y, and Z axis values should change rapidly and the little graphic should move. If the numbers are stuck or don't respond, there could be a hardware sensor issue.
Check for Physical Interference
Make sure you're not accidentally touching the screen while trying to rotate the phone. One UI can interpret touch input as an intention to keep the screen still. Also, remove any thick or magnetic phone cases, as they can occasionally interfere with the internal sensors.
If you've recently had the phone repaired, ensure the display was reconnected properly, as a loose cable can affect sensor function.
