
Alternatively, you can mark it "irregular", which also avoids your measures being counted as two, but does not show a measure number, so you can create one yourself - perhaps in parentheses using a text field ( Ctrl+ T). You can either enter -1 to the "add to measure number" field, which gives your new measure the same number as the previous one, but makes the measure number appear normally in front of the system. Fix measure numbering: Right-click the measure on the new staff and Measure Properties.You can also drag a system break from the palette onto the bar line. Force a system break, if necessary: If the second measure is still on the same system as the first, select the bar line between the measures by clicking on it and press Return.Hide bar line: Right-click on the bar lines between your two measures and Make Invisible from the menu.For example, if you are in 4/4 time and moved a section with one quarter length to the second bar, make the first bar 3/4 and the second 1/4 in actual duration. On each measure, right-click the measure, Measure Properties. Adjust actual measure durations of both measures: Now you have to delete the rests at the end of both measures.After that, select all staves of your second measure and Edit → Paste or press Ctrl+ V (Mac: ⌘+ V).

Please make sure your selection spans all staves of the system. Move the notes that shall go to the new system to the new empty bar: Select all notes after the position where the system break should go and Edit → Cut or press Ctrl+ X (Mac: ⌘+ X).If it's the last measure in your score, use Create → Measure → Append Measure, or with the keyboard Ctrl+ B (Mac: ⌘+ B).

So if I have Thunderbird open in my first monitor, and Chrome open in my second monitor, the way Id expect it to work (and the way it works in every other OS Ive worked with) is that the menubar for Thunderbird is available in the first.
