Please give a complete answer. We can't know the implications of pressing the function keys if we don't know exactly what happened before you pressed them. When did you press Esc? What happened? What did you see?
If we are going to be able to help we need more than one line answers like "It didn't work" or "it did nothing". we can't see your tablet so you need to tell us everything. Too many good people are trying to guess what you see. Please tell us.
I suspect at the end of all this we might have to conclude the answer to your question is "it doesn't, at least, not on the tablet you've got", but we're not there yet because you haven't given us enough information.