a "+" sign at the the top of the editing bar?

• Sep 20, 2020 - 05:37

Hi, I am new to MuseScore...
Trying to retype my music theory q so I can hear how i put notes within...

But when I type in notes, then the bar extended....and I found there is a "+" sign.
Is that something wrong when I choose the setting or ....don't know...@_@.

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