There is a keyboard shortcut in a browser game that I play where the Alt key is very important to me. However, when I press that key Opera opens the menu. I already looked at the keyboard shortcuts in the settings but found nothing that could remove this. Can someone help me? (Incidentally, Google Chrome doesn’t have this problem, so don’t say the problem is with the game as it works perfectly on Chrome.)

The image shows that there is no shortcut to open the main menu. And, I already tried to put any shortcut, but still kept opening the menu when I press Alt