Remove some text boxes in Mame64 emulator

I use to play classics videogames in MAME (It is a popular arcade emulador, I suppose you know about it)
When you are playing mame you are able to use some functions like save and load states. Its allows you to Save the game at certains points; later (the Next day) you can back again at that point.
So, this is the job I want:
You have to work with MAME64UI (version 2.20, It doesn mind if is posterior)
When a the key "Save state" is pressed, the Game is paused and a black text box shows you the text "press position to Save to". You should remove this box without losing the saving functionality.


Idem with the key "Load state is pressed"

This is, for a far view, that I want. I Will tell you most exactly specifications (about what "text box" I want to exactly remove)

Please ask me