Windows Snap does not work with Hyper-V connections
If you try to use Windows Snap the RDP session of a Hyper-V guest will minimize down to 3 icons.
I recently bought a monitor with 21:9 thought I could snap 2 Hyper-V guest connections opened from Hyper-V MMC and use Windows Snap to put them side by side and scale.
Nope! This is pretty bad design.
Karl W-E. commented
this got fixed in Windows 10 1803 thanks!