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