macOS: Is there a way to keep the Emoji & Symbol viewer on top/without disappearing? Since I'm not a MacBook Pro /w Touch Bar user, I occasionally use the macOS Emoji &amp; Symbols viewer to double-click various emoji entries into the system. However, the Emoji &amp; Symbols viewer is annoying because it's easily hidden by other application windows, and it seems to disappear once you click outside of the application window and select another app.

I can't find a way to make it "float" on the Desktop, or to prevent it from closing when switching to another app?
No, it opens on a per-app basis.  

You can open it twice [or more], in different apps, &amp; it will remember position &amp; settings separately for each &amp; swap between as you switch apps.

It used to be global, a long time ago, but hasn't been for quite some time.