Commands:

/manager
Opens a GUI with all world manager toggle buttons

/manager togglepvp
Toggles Player vs Player combat

/manager togglepve
Toggles Player vs Entity combat

/manager togglefreeze
Toggles players being frozen (cant move forwards,backwards, up or down)

/manager toggleend
Toggles End travel

/manager togglenether
Toggles Nether travel

Permissions:

manager.admin
Permission to all commands

manager.bypass
Bypass all world event managers