I have downloaded spacedesk on my Windows laptop, and am trying to use my macbook as a second screen, using the spacedesk html5 viewer. I am able to connect, but the macbook just mirrors my windows laptop, rather than acting as a second screen. Is this because of my macbook settings? Is it possible to have the macbook as a second screen, so I can drag applications from one screen to the other? Thank you!
You can easily switch the spacedesk display to Extension mode via Windows Display Settings or via Display Switch (Windows logo + P hotkey).
For assistance, please read the Configuration and Settings -> Windows PC (Primary Machine) chapter in the user manual.