Grey bar in text <p> field
I'm adding photos and text to DW 2020 to pages some of which were created in Go Live.
When I add a <p> I get an annoying grey bar at the bottom of the text field as shown in the photo. Apart from making it hard to see the text, it sometimes stops me from selecting the text to edit it. Is this a bug or have I done something wrong to settings? (Just before it started I messed with the min-max settings.

