Operating Modes can be removed from a design using the Explorer Tree or operations in the Design menu. Once removed, Operating Modes can not be restored.
How To Delete Operating Modes
1
In the Explorer tree, select the Operating Mode(s) to be deleted.
2
Choose "Delete..." from the "Edit" menu.
Alternative 1: Right-click on any of the highlighted Operating Modes and select "Delete".
Alternative 2: Choose "Delete..." from the Operating Modes submenu within the Design menu.
Alternative 3: All Operating Modes can be removed from the design by selecting "Delete All.." from the Operating Modes submenu within the Design menu (this operation can be invoked with nothing selected).