What you you see in the book list context (right click) menu?
If you have a device attached try disconnecting it.
If that doesn't work you could try uninstalling calibre and reinstalling it - you shouldn't lose any settings or libraries - but I don't see why that should fix it.
FYI - defaults for Main toolbar and Main toolbar when device attached
BR
Last edited by BetterRed; 07-09-2018 at 08:24 PM.
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