If F2 even when set in Preferences for External Editor triggers it when keyboard focus is clearly in BookBrowser (and not grabbed back by CodeView) that is a bug by the definition of "keyboard focus". It should be processed and absorbed by BookBrowser.
Please double check that for me. Please try assigning F2 to ExternalEditor in Preferences and restart Sigil. The use focus on BookBrowser key sequence to bring focus to a file in BookBrowser (maybe use arrow keys to select one) then hit F2. It really should allow that file name to be edited. If not, maybe something is broken in Sigil's shortcut processing on your platform.
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