MeshTrim, keeping the part outside the cutting object only

Rhino Rhino for Windows
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1

The documentation for the MeshTrim command states that the part of the mesh inside or outside the cutting object can be kept. In my case, when I run the command only the part inside is preserved. How can I achieve the opposite?

The MeshTrim command deletes selected portions of a mesh inside or outside where they are intersected with another object.

2

Take a look at the documentation for the Trim command, especially step 2 under “Steps”.
I’m assuming MeshTrim follows the same scheme: when picking the object to be cut, select it on the part you want to throw away. Does this help?