Shortcut to Close Tabs?

Hi all-
 

 I'm familiar with the "manage notepads" option under the View menu to close notepad tabs.  But isn't there a click shortcut to close individual tabs?  It escapes me.  I know I can left click a tab to add another notepad or feature to a view, but aside from the manage dialog, what's the shortcut to close a tab/notepad/etc.
 

 A bit rusty, but running flawlessly under Windows 10.
 

 Ken LiveFromStPete