I want to create various keyboard shortcuts within TeXstudio, but my problem is that the left Alt key takes me out of the text editor and into the File/Edit/View menus (so I can navigate around these menus with the arrow keys). If I press Alt L again, I return to the text editor. How can I disable Alt L from doing this, so that I can use e.g. Alt+a for \alpha, and so on? Thank you.