Aqua Datastudio 18. Is there a keyboard shortcut to close the read-only view window?

When I am checking errors reported during ad-hoc query execution I often double-click on the error cell and/or referenced code cell to examine it in the popup View window. But I can't find a keyboard shortcut to close that view window and it is driving me nuts clicking on the red dot or the close button. Is it called something else and I am just not seeing it in the keyboard panel?

Thanks,

Kevin