In the old edit world UI (json UI), you can't disable "Education Edition" toggle when you created the world or enabled it in the edit world.
But in the latest beta/Preview version, you can disable "Education Edition" toggle in the new edit world UI, and it can be destroyed the world.
MCPE-177604
"Education Edition" toggle can be disabled in the Ore UI Edit World screen
Open
4
(Unassigned)
1157744, 1441084
Confirmed
Multiple
OreUI
1.20.60.23 Preview, 1.20.60.25 Preview, 1.20.60.24 Preview, 1.21.50.24 Preview, 1.21.40.22 Preview, ..., 1.21.30, 1.21.31 Hotfix, 1.21.60.28 Preview, 1.21.51 Hotfix, 1.21.131 Hotfix
Retrieved
My world has been become some update blocks because I turned off the experimental features with the new edit world UI