Controls in Time manager are all disabled

Hi, my Debian Trixie is installed at last; thank you all who helped. 
BTW, speech in GUI and console are working side by side like a charm.

I've chosen Mate, and now I need to adjust the time; It is wrong, 
probably because I chose local time instead of UTC during the 
installation, in order not to disturb the other installed OS. When I 
access the time manager found in Preferences -> hardware, all the 
controls such as the edit timezone button and the hour selector are 
disabled, except the close button. I've checked them using Orca's object 
navigating commands.

Any hint please?
thanks,
Cleverson