Disabeling figure shortcuts (alt + something) programmatically

Hello,

I am maintaining some MATLAB GUI Program (written using GUIDE) for annotating physiological waveforms. Essentially, given a plot of a time series the goal is to annotate certain events. Unfortunately, the developer before me chose to use keyboard combinations such as 'left mouse + alt' and 'left mouse + d' for manually annotating the waveforms. On windows (not on mac) this, however, opens the toolbar of the figure window and thus interferes with the signal labeling.

Is there a way to programmatically (or worst case manually) disable the shortcuts for the figure window, i.e., 'alt + something' should not open the drop down menu.

Thanks!

PS: Under 'preferences --> keyboard --> shortcuts' I could not find the shortcuts for the figure window.