howto sort channels?

Hi,

How can I sort channels using VDR VNSI Client on Kodi 17 (LibreELEC 8)?
I’ve searched for channels in General -> PVR Live TV and found nearly 1000 channels (DVB-S2). Now I want to filter these channels and I opened group manager, added a new group and inserted all needed channels from ungrouped channels list to my new group.
Ok, that’s fine but how can I sort channels in my group?

I’ve also tried to place a presorted channels.conf to /storage/.kodi/addons/service.multimedia.vdr-addon/config/channels.conf but it is ignored. It seems that Kodi only adds channels to the SQLite Database .kodi/userdata/Database/TV29.db and channels.conf is ignoried. Am I right? Is there any AddOn to easily sort the channels list?

Thanks!