Hello,
Sorry to hear you are having issues. First please check if you have not Locked your Fences. Perhaps, you have previously locked it and did not unlocked it before you upgrade to Fences 6. If "Lock Fences" does not appear under your right click menu, try this guide: https://support.stardock.com/space/SHC/1621360668/Show+%22Lock+Fences%22+in+Fences+5.
If that not it, try looking into this setting.

Thank you,
Basj,
Stardock Community Assistant.