I am editing a style that has been in existence for some months.
I want to change the colour of the Label Text Before and After (I have no idea why at some point I must have chosen different colours).
I can change the text itself but the drop down list for the colours is locked. The colour is a slightly grey version of the one in the preview, and the drop-list button is inoperative.
If I scroll down the highlighter panel to the 'text above entry' within the same style, the colour is editable, and the drop-list button and icon cause the mouse to change shape (to the white pointing hand).

I have been able to change other facets of this style (removed some lines etc.) but not the capsule colours.