Now check the MicroMap and see the same colour is in there too showing all instances of the word throughout. Again, hard to see and unable to find where it is to edit it.
2. The currently selected word however, is TextHighlight. This I found in the settings-theme-ui and changed to that blue colour as shown in the MicroMap.
If the "Currently Selected Word" can be edited in the theme-ui config, shouldn't the "Find Highlight"?
I can find nothing with a similar colour in the theme-ui file, or in the lexer's colour settings. Maybe I did it in the past, but I would like to change it and cannot find where it is!

PS. Unable to repeat that issue with the crash now! Good news i suppose.