You can brace define the hall sections or remove existing braces from the hall settings dialog.
Location of the Brace Feature
Select the hall you want to brace and click the right mouse button. Click the Properties line from the right click menu that opens.
Enter the hall settings.
Select the hall you want to define brace from the list of halls.
Select the section you will define brace and check the brace box.
To remove the existing brace, uncheck the brace box for that partition.
Your diagonals will be formed according to the arrangement you made.
Status of halls when brace defined in partition 1, 3 and 5
Status of halls when brace defined in partition 2 and 5