It seems that snap is being used a verb. (Not as a noun, which could apply to Ubuntu's type of Snap applications.)
As a verb, it's likely something that Windows does (if not other operating systems, although I'm not sure).
From "How to Snap Apps Side by Side in Windows 10" by Ciprian Adrian Rusen:
If you need to work with two apps at the same time in Windows 10, it’s a good idea to snap them side by side so that each consumes half of the screen. To snap one app to the left, use the mouse to drag the title bar of the first app to the left side of the screen.
Apparently, the sentence in the question is describing how to accomplish this with voice commands.
Of course, this could likely be confirmed if the source of the sentence were provided.