Just notinced after 23.7 upgrade, all my firewall groups are not showing under 'Interfaces' section anymore. After tinkering with this for a bit, I noticed the groups will show IF only one member is selected.
When multiple members are selected, the interface disappears, but it still present in form under RULES section - this didn't happen in 23.1.11.
I've checked the '(no) GUI groups' option - it's not ticked, but doesn't matter anyway as it's no longer honouring this check mark.
This should help
https://forum.opnsense.org/index.php?topic=35113.msg170271#msg170271 (https://forum.opnsense.org/index.php?topic=35113.msg170271#msg170271)
I do a Update to Version23.7.1 and now I finde some groups on Interfaces and on Firerwall\Rules.
I have attaced some pictures from the current status.