How to close a findPersistent dialog?

Added findPersistent to my CodeMirror instance. It works perfectly. The only thing I’m not able to figure out is how to close this dialog when I’m finished using it. Tried Alt-f, Esc, Ctrl-f but nothing works.
Can you help me?
Codemirror 5.55.0 in Chrome 83.0.4103.116 on Windows10

I found an half-solution (that seems undocumented). I added to extraKeys the entry "Esc": "clearSearch". It seems to work. Or is there another solution?
Thanks for your help!