I used displayfusion everything worked fine. I formatted SSD and reinstalled windows 10 and fusion and now snapping doesnt work despite reading every related post on this forum.
Scenario: I have a super ultra wide monitor, I have set my DF Monitor Configuration to 3 split. I can see the split is working. When I drag a window to the edge of any split or use the maximise button on the window, it maximises to the whole monitor, not the DF split monitor.
Nothing I change can seem to get this working.

Thanks but I downgraded to 9.9 and my problems are solved. 10 was also buggy.

If I were you to avoid this frustration for users I would remove 10 and 10 beta from the downloads page until they are stable - neither of them worked for me on a fresh install of windows 10. 9.9 seems fine and is what I had previously.

One difference I have noticed between 9.9 and 10 and 10 Beta is that 9.9 installs a .net package and im not sure if that package is needed for DF but was removed from the 10 installers for a reason or by accident and thats why DF doesnt work in those releases?

Let me know if need anything else.