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KevinH - given how many programs don't honour the Insertion cursor thickness setting in Windows I am not expecting you to spend much time on it. Where it is honoured, I've come to know that the insertion point is before the character under the thick vertical bar, viz:
**
The highlighting of the current display line when the CV window doesn't have focus is more of an issue for me. I like to use the Tab key to move between 'panels' - if the display line highlight was only shown when CV has KB focus I would know when I landed on it, as it is now I often inadvertently insert Tabs in the text.
** that's the calibre Comments editor, I think it's some sort of QT textedit widget. It seems to be browser based widgets that don't honour the cursor thickness setting - except Edge, which is based on Chrome
BR