Doesnt seem to work like that, I have tried it. I also have steam and it can be made smaller but I canot do it with Galaxy.
Attach a screenshot of your Galaxy.
I tried for about an hour to get a screenshot and couldnt, kept saying wrong format no matter what format I used. Im not that comp savy but can get around, I looked on the web for help but nothing worked. I came to GOG because I was tired of Steams garbage and now right away having problems.
Issues I wonder about:
1. No option to change color or lessen its brightness of Galaxy, (not that I have found anyway)
2. Even in small window Galaxy is off the screen and I have to move the entire window to see whats off the edge. No other program or game on my PC reacts like this).
P.S. The only real issue is the screen size.