You're going to have to do some of your own troubleshooting first so we have more information to accurately fix your problem

Power off your phone. Hold Volume Up and the Power button for a few seconds. A screen with different options will show up. Navigate using the volume buttons to move up and down and the power button to select. Select "Wipe Data/Factory Reset" This will reset all unsynced data on your device. You can use your Google Account after you restart the device to get back into your phone.

sometimes it just takes a simple turning it off and back on again. try restarting your phone and see if it fixes the issue, this helps me with my Samsung A14's fingerprint sensor very often

Here is a guide to help you: Samsung Galaxy A14 Screen Replacement

Hello! You can download fonts from the Galaxy store. To do this, head into your settings app. Scroll down to find Display, it should have a green sun icon. Scroll down a bit more and click on Font Size and Style. Click Font Style. Select Download Fonts. There, you can see Samsung's collection of fonts. Pick which one you would like to download. Then, go back to the Font Style page and select it.