@BetterRed: F2 works for me no matter what is in the composite. I tried it with plain text, a simple template {title}, and a GPM template. I tried changing the option you mentioned and it did what I expect. With the option off and the tweak "Control behavior of the book list (ID: doubleclick_on_library_view)" at its defaults, a single click opened the template editor. With the option on, a single click showed "editing templates disabled". In both cases F2 opened the template editor.
NB: I had to restart calibre for that option change to take effect but the "must restart" message wasn't shown. That should be fixed, but I can't do it for a while.
I don't know why you see something different.
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