Get the Google Meet mute mic keyboard shortcut working in Safari 14?
You just need to remove the unwanted command by replacing it with 'garbage' - something you don't already use or need...

System Prefs &gt; Keyboard &gt; Shortcuts &gt; App Shortcuts
Click + then add the name of your desired app.
Type the exact name of the menu item you wish to replace[1]
Add a garbage command [anything will do, so long as it's not going to conflict anywhere else]


[1] This is especially important if the menu ends in an ellipsis … which typographically is not the same as three full stops ...
There is no need to specify any menu/sub-menu structure, no matter how far down the hierarchy your menu item may be - it will always find it using just the actual item name.
If you have two menu items with the same name but in different sub-menus, you can differentiate by giving the actual menu path using -&gt; as the sub-menu indicator, eg
File-&gt;Open-&gt;Open Special Name