Hi,
I 'd like to display the resolution menu dialog window ONLY on demand (i mean by clicking on a button on the screen but NOT when starting the game . Is that possible ? (I’m afraid not).
Freid
You can implement some sort of resolution switching yourself. Screen class can return a list of supported resolutions and can set any resolution.
To turn it off, go to edit → project settings → player.
Show screen selector.
thanks guys 
Yep i saw that i can hide it that dialog and i saw the Screen classes methods, i guess i’m just too lazy to think about coding that menu by myself, but maybe its the best way if i wanna get an option menu like in many games, i mean with sound graphics settings. Thanks again guys.