Category description for location problem

Hi guys,
I’ve a problem with event’s description for each locations. I have a default category’s description for main place and different category’s description for each locations.

Ex:
Events >> Events categories >> Categories XXX» Description A for Category XXX + Description B for category XXX and Place B + Description C for category XXX and Place C, etc…

Today i tried to modify a singular place category description but Category Location select seems not to switch to singular locations. I tried to modify the first location description but it doesen’t work.

Could you help me.

Thanks

Stefano