How to deselect several faces or lines by one operation when selecting features

Hello every one.

I'm a newbie with SimLab. I have one question about selecting features.

For example, when selecting faces, I can select several faces by dragging the left mouse button. But I can't deselect several faces by dragging the right button like what I do in hypermesh. I can only deselect faces one by one. How could I deselect several faces by one operation? Or is there any shortcut I need to set in Preferences?

Thanks in advance!

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