[KevinH]

Thank you for testing and reporting back.

Using the qss stylesheet Becky gave you along with this will create havoc. I would not recommend that. Always choose one or the other approach to focus highlighting. Preview focus highlights will only work with the official focus highlight setting but not with the qss stylesheet as it uses its own technique for creating a focus highlight.

That border highlight colour is chosen from your Qt application palette Highlight colour which is set to match your system highlight colour by Qt. There is an environment variable you can set to override the colour. For example.

SIGIL_FOCUS_HIGHLIGHT_COLOR="#4AAAFF"

That will override the colour used to highlight focus everywhere including Preview which did not focus highlight previously.

As for the ability to tab shift focus onto the Preview toolbar, that was something you asked for that was not possible before.