Until the video comes out, after any initial selection is established (red vertices), further selection:

• w Alt pressed, removes the new selection from the existing selection
• w Ctrl pressed, adds the new selection to the existing selection
• w no keys pressed, replaces the existing selection

More details in the docs, section 5.7, pg 86, and the Utilities tab's 'Mouse and Shortcuts' pop-up, also described in section 5.10, pg 112.

Hope this helps,

VWD3D (dan)

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Current VWD Version:   Release: V2.2.924.6464 - 2019/12/12, 9:46am
Qualifier: Yes, I'm helping Gérald with VWD, Nooo, I'm not yet an expert on its use!