If you click on a selected image frame while pressing [Control] (or right-click) to open a context menu, you will see the following rich context menu:

However, most functions which are offered in this context menu, are also available in the menu bar of iCalamus. The only menu item of interest here is 'Adjust', which offers the following options:

Tip: For more information about these functions read the
chapter Enhanced geometry functions
of the Geometry
inspector
.