local storage: Container option not removable?

Hi,

Seems there is a GUI Bug:

The GUI in PVE 3.1 shows always 'Containers' as content option on local storage but not in storage.cfg;
Tried to disable it in GUI, storage.cfg is written correctly but GUI still shows Containers;

It's also not possible to disable local storage - but not sure if this expected;

# cat /etc/pve/storage.cfg
dir: local
path /var/lib/vz
content iso,vztmpl
maxfiles 0

Alex