HA iOS App zoom-in & zoom-out don't work

I’ve installed the app for iOS and I use Lovelace as a frontend but when I try to zoom in, it doesn’t work, while at other people works.
No one remembers having enabled anything and the settings seem the same.
Can someone help me?
PS: if i login via browser and i try to enlarge the lovelace frontend works.
Tnx and BR