I am a current Fences 3 user and I recently tried an upgrade to version 4. However I found a new feature very confusing.
Every time I attempted the 'Peek' option the only result was that the Windows 10 Start Menu appeared. This is despite the fact that I do not normally use the Windows Start Menu, I have always preferred Classic Shell. I am not certain if I am performing the feature correctly, the demo video is not clear about the actual steps required.