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They could turn on the properties panel manually then start the add subassembly command.
If they try to turn on the properties panel manually and is still doesn't appear, it may be outside of the screen area. if so try this...
turn on the panel
press alt+space
press m for move (see image)
use arrow keys left and right to move panel back onto screen
Cheers,
Did this solve your issue?
See attached,
Cheers,
Just the default format the screen clip program uses