When trying to configure the folder quota of groups from within the group management tab, there's no adjustment to the folder quotas made.
Open Group tab
Open tab "Coach"
mark checkbox "Check" of a group
click button "Configure" under table --> list of group tools opens
mark checkbox "folder", then select "On" radiobutten --> folder configuration opens
change quota, finish
check folder quota in respective group -> quota wasn't adjusted
quota changed this way should of course be adapted and shown as specific quota for this folder