In the editor, the highlight colour for selected text can be difficult to see
Musescore 3.5.2, on Windows 10.
The highlight colour for selected text is pale, and I find it difficult to differentiate from the editor's white background. Because it's a similar hue to the text itself, I find it particularly difficult to differentiate between a "completely selected" text item, and a "completely deselected" one. This is a particular problem when editing small items (e.g. dynamics, chord symbols) while zoomed out.
The fix would be to imitate the text highlighting behaviour of most user interfaces: render the highlight colour in a dark shade, and render selected text as white.
I would also suggest making the highlight colour slightly darker for text-field controls - for example, those in the "Preferences" dialog.