Gvim and Alt-F10

I'm on Xubuntu 20.04 and using vim 8.1

In gvim, the Alt-F10 key is co-opted to display the File pull-down menu.  I have a series of remapped assignments for all of the function keys.  These all work well for vim in a terminal window, but this single one fails due to this built-in menu assignment.

Is there an easy way to deactivate this so that the Alt-F10 code (<M-F10>) can be assigned to my purpose?

Thanks.

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