Content browser custom shortcuts

such as to delete the folder , i have to click the"delete" key.

I want to use X as the delete key to make my work faster.

I tried to change the [editor preferences > common command > delete] , but this only work in the scene.

Then i go to [editor preferences > content browser],
but there are only the shortcuts about [create folder] ,[open folder] etc. do not have the shortcut about delete.

SO HOW SHOULD I CUSTOM THE DELETE KEY IN CONTENT BROWSER??