You can show system dividers between systems in flows that include a set minimum number of players. You can change whether system dividers are shown, and change the minimum number of players for which system dividers are shown, in each layout independently.
Procedure
In Setup mode, choose Setup > Layout Options.
The Layout Options dialog opens.
In the Layouts list, select the layouts in which you want to show system dividers in one of the following ways:
Click Select All.
Click Select All Full Score Layouts.
Click Select All Part Layouts.
Click Select All Custom Score Layouts.
Ctrl/Cmd-click individual layouts.
Shift-click adjacent layouts.
Select Staves and Systems from the Category menu.
In the System Dividers section, activate Show system dividers for flows with at least [X] players.
Optional: Change the minimum number of players for which you want to show system dividers in any of the following ways:
Enter a value into the value field.
Click the arrows beside the value field.
Optional: Choose one of the following options for Appearance:
Default
Long
Extra long
Click Apply, then Close.
Result
System dividers are shown between systems in the selected layouts in every flow that contains the minimum number of players you set.