Use the options on the Simulation > Sectional Stock View menu to remove a section of the stock during simulation. This can be useful if you need a better view of the tools machining in the inside diameter (ID) of the stock.
The following options are available:
3/4 Section — This removes 1/4 of the stock.
1/2 Section — This removes 1/2 of the stock.
1/4 Section — This removes 3/4 of the stock.
Full Stock View — This shows the full stock, without a section removed.