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Ah, I just found the grey part I mentioned earlier, it's when a word is selected I think!

Just double checked, it is where the currently selected text is. Which setting does this use?

It's ok, found it. I can't use it as I don't want there to be a background colour on selection.

for other users, I wrote more detailed description of option "ui_lexer_themes" in default.json.

Excellent, thanks for your help