Can I change thumbnail size?

[WilliamB]

I would like to make my thumbnails bigger while monitoring. I only have 6 computers I want to monitor and I'd like the 6 thumbails to fill the monitoring page. Is there any way to set the thumbnail size?
Thank you.

[WilliamB]

looks like thumbnails resize nicely when I click on the Veyon notification icon twice. The first click minimizes the Veyon Master window; second click restores the Master window and the moniotored thumbnails get resized.
Oh, I also just discovered the slider and buttons along the bottom of the window - that's what I was looking for!