I’ll try.
First know your terminal’s sign in using device code “code”.
Assuming your terminal is in API mode (Powered by Square) on the screen, swipe from the left to the right and the menu will appear. in settings, sign out, then sign in again with your username and password rather than the device code. You can then turn off the receipt printing and / or the signature screen. Save the settings and sign out again this time using the device code. The terminal should return to API mode (says Powered by Square) and then you can use it as you were but the receipt printing and or signature screen will set as you set it. on or off.
I hope this helps.