When I created nested tuplets in Musescore, there was always a connected line between notes that I couldn't delete. How can I do to remove them. (Redundant lines are underlined in red in the detached image).
Your help means so much to me!
Have you tried the Beam Symbols in the Beam Properties section of your workspace? I believe the upper rightmost of those Beam Symbols should do what you desire (as long as you successfully drag that symbol there). See https://musescore.org/en/handbook/beams for more details and for pictures of the Beam Symbols.