Turn off Rstudio menu shortcuts? "Modify Keyboard shortcuts" didn't work

Yes, thats how I tried to turn off the mentioned shortcuts and use Alt+F for "Delete". But although there are no conflicts shown as soon as I press Alt+F for example, the File Menu opens up and not "Delete"? Thanks for a reply. My problem seems to be similar to the one described in this comment for example: Emacs key binding - #4 by Sophia