What is the function of bent arrow or "new file" greyed icon at the end of the stave?

• Apr 19, 2023 - 22:17

Mu4
I imported a .pdf. It generally functions OK.
But At the end of each line are these icons, (image attached). If I rt click I have the option to cut, copy, paste, swap, delete, select, edit element.
THe "New file" icon seems to have the same functions as the bent arrow thing.
If I click to delete, 3 bars are taken from the next line and squashed into the line I am on. The notes in the next line, now only 1 bar, are stretched to fill the whole line.
What's going on?


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