Zones are registerd correcly when the "Allow zones to span across monitors" is disabled (it is uncecked by default, but on my computer the muiltimontor span seems to be active anyway). Problem's corrected by checking and unchecking the "Allow zones to span across monitors" checkbox.
ℹ Computer information
📝 Provide detailed reproduction steps (if any)
✔️ Expected result
To see that the new layout has been saved
❌ Actual result
You get the default (stacked) zones
Zones are registerd correcly when the "Allow zones to span across monitors" is disabled (it is uncecked by default, but on my computer the muiltimontor span seems to be active anyway). Problem's corrected by checking and unchecking the "Allow zones to span across monitors" checkbox.