What to do when the touchscreen of Galaxy Device responds slowly or improperly?
Force reboot the phone
Press and hold the Volume down and Power keys for 7 to 10 seconds to perform a forced reboot or soft reset. On the Note10, press and hold the Volume down key and Side key for 7 to 10 seconds.
Check for a Software update
Navigate to and open Settings. Swipe to and tap Software update or System update. Tap Check for updates or Download and install. If an update is available, follow the on-screen instructions to complete it.
Note: The update menu and options will differ slightly depending on your model.
Optimize your storage
The Device care feature will improve your phone's overall performance by scanning for wasted storage space and other potential issues. Navigate to and open Settings. Tap Device care, and then tap Optimize now. You should also check make sure your phone has enough storage.
Reboot the phone in Safe mode
Press and hold the Power key until the Power menu is displayed. Touch and hold Power off until the Safe mode icon is displayed. Tap Safe mode to start your phone in Safe mode.Once the phone reboots, enter your credentials if you have a Lock screen set up. Safe mode will display at the bottom of the screen.
Remove cases and screen protectors from the phone.
Remove all screen protectors and cases, make sure the touchscreen is dry and clean, and remove gloves if you're wearing them. The screen may not recognize touches through gloves or extremely dry and chapped fingers.
Increase touchscreen sensitivity on the phone
From the home screen, swipe up for the Apps Screen and tap Settings. You can also pull the notification bar down and touch the Settings icon.
Scroll down and touch Advanced Features.
Scroll down and find Touch sensitivity. Tap the slider next to it to enable it.