When I add a note to a highlighted text (right click - Add Note), the background is transparent, which makes it difficult to read because it overlaps with the PDF text (example screenshot below). I know this does not happen when I add a note directly without linking it to a text. I could do it that way, but I prefer to have comments linked to a specific text I select. Does anybody know how to make the background not transparent? Thanks in advance.
Thanks for the reply. I had tried that before, and that was the problem: I can only change the colour when the note is not linked to a highlighted text section. In the end I used normal notes (not linked to text) and I noticed that changing colour does not work properly for all the colours in the palette. In some cases, the "minimized" square does change to the selected colour, but when displaying the content of the note, its background is either transparent or yellow.
I recently updated my macbook to Mojave, I don't know if that could be related.
If your annotation is set to Underline, the note will be transparent.
Try this: set annotation to Underline in the Menu > Tools > Annotate. Double-click to select a word to test that it will underline. Go to the toolbar, and in the dropdown of the Highlight icon select (e.g.) Yellow. Now double-click a word to highlight it in yellow. Then click with two fingers on a trackpad or use Ctrl-click to bring up the contextual menu... select "Add Note" ... the note will now be in yellow.