Shell or region command
The following functions can be applied to a shell, or only to the selected region.
To apply above commands only to the selected region, select faces, or region of interest before selecting menus. Then, the name of each menu changes automatically from the shell menu to the region menu. ( See Select >> Entities >> Face ) For example, the menu Build >> Shrink Shell changes into Build >> Shrink Region.
If there is no selected region, these commands are applied to the selected shell.