Preferences: Toolbars & Menus: <select the toolbar>
Remember that Calibre has different toolbars depending on whether a device is connected or not (and a few other modes of use).
You can always obliterate all traces by first using Preferences: Plugins: and selecting to Remove the selected (this on is under User Interface) PI
THEN
remove any remnant (usually just a JSON)of the plugin name from the Plugins sub folder .
Note: Uninstalling a PI from the menus does not remove settings (just like Calibre), thus the last bit surgery. In the 10 years of Calibre use, I had to do this ONCE because normal methods would not work (Calibre had been thru many major release by then, so who knows what got corrupted )
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