How to make the + sign disappear from sheet music?

• 2023년 3월 29일 - 07:59

In the sheet music, even if I use delete or backspace, the + sign in the picture does not disappear. It doesn't even make a selection, and even if I delete the entire problematic part, everything behind it gets twisted. How can i solve this problem?
(Sorry if my english is weird. I don't know English very well, so I used a translator.

첨부 파일 파일 크기
IMG_6890 (1).jpg 2.25 MB

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