This issue is in another post from 6 years ago, the problem still exists in Version 4... https://community.logmein.com/t5/GoToAssist-Remote-Support/unattended-window-randomly-pops-to-foreground/m...
We were never able to recreate this issue ourselves and identify a bug. My recommendation would be to close the window that lists your Unattended Support computers once you are in session with the computers you want to work on.
