If you have broken the barlines, you can use the Glue tool to connect them again.
Procedure
- Select the Glue tool.
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Click one of the barlines in the staff above the broken barlines.
All barlines between these staves in this grand staff are connected.
To re-connect barlines in several grand staves, hold down Alt and click with the Glue tool.
The barlines between the corresponding staves are connected in all following grand staves.