You must have altered something else somewhere. If you’re referring to them as a customer hopefully you’ve got a few panels, experience etc. Save yourself some hassle and just clean start the panel.
What do you mean you have the zone set as final exit? Do you mean the door contact?
Timed should be working fine. Are you sure they are setting Area B?
Try changing it to final exit / timed just to see if it works then?
Presumably for Area B exit you have a timer setup?
Turn on a walk test either from the user or engineering menu. When you walk past the input in question it will clear from the screen.
To be honest though unless you’re in a mansion with 100 sensors just change the batteries in them all….
Buttons in the grand scheme of things vs how...
You might be fine but you may also end up with an error on the panel that you can’t clear if the tamper goes off. There’s no way of knowing if this will happen up front and like I say, unlikely the panel would have been setup in this way - but not impossible.