First please try this, like Support proposed;
it is sufficient most of the time:
.
Please note a Zigbee reset is a last resort fix attempt.
To answer your questions about that:
It is - looking there right away was quicker than posting a question here 
It’s also @ mobile app, …More > Settings > Zigbee
Yes, all devices dissapear right away;
Then, you have to pair all of them again.
All flows involved will break, but there’s a great script to repair them → https://community.homey.app/t/how-to-pro-cloud-tool-to-fix-advanced-flows-after-removing-and-re-adding-devices/65018
- rename all of your zigbee devices by adding a 1 or such, like,
my device1 - write down, or copy paste all zigbee device names
- Perform zigbee reset
- Pair all devices again, and name them like the ‘old’ devices again
- Now use the script to replace the old device name (like
my device1) with the new device name (my device)
Your flows should be fixed now.
