Increase disk space quota for multi-user

(SF 4.4 XA2 Dual, licence)
I created a new user (settings → users)
I noticed the disk space for the new simple user (!=admin) is very small.
I believe this is related to the quota program, user.aquota and some services.

Do one of you know how I can increase the allowed space for the new user?
I did find nothing on TJC not SFO nor did I find a readable config file or understood how to edit aquota.user.

The unavailable /home free space is back to the simple user (settings → storage) if I brutally modify the below file.
Can that have bad consequences?

Original /usr/lib/systemd/system/quota@.service:

Description=Enable quota and run quotacheck for %i

ExecStartPre=/bin/mount -o remount,usrjquota=aquota.user,jqfmt=vfsv0 %I
ExecStart=/usr/sbin/quotacheck %I
ExecStartPost=/usr/sbin/quotaon %I


Modified in /usr/lib/systemd/system/quota@.service (4 lines):

#ExecStartPre=/bin/mount -o remount,usrjquota=aquota.user,jqfmt=vfsv0 %I
#ExecStart=/usr/sbin/quotacheck %I
#ExecStartPost=/usr/sbin/quotaon %I


Unless related to this reset bug, seems to work so far.