I have just released version 1.11.2 if the plugin. This is a fix for the calibre 6/Qt6 issue reported by @astergremlin. There are no other to the plugin.
The release notes are:
- Fix: Qt6 compatiblility - Prefs viewer tab stops.
As usual, calibre will announce the update in the next hour or so. And any problems with the plugin should be reported here.