How to close floating window

In the latest Firefox and on MacOS (and probably the case with other browsers), after logging in to the Bitwarden extension and dropping down the vault window, one can see in the left hand corner a box with an arrow (point up and to the left). Click on that creates a floating window.

Ok, now, how do I close that window?? It has no window controls from the OS, no Close/Minimize/Maximize control nor can I drag it around for optimal placement. But I cannot close the window w/o closing the browser.

How do I close this floating/popout window??

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