Mac Excel 365 Changed the character used to separate thousands and decimals after office update

Hi,

after updating either Office 365  or Mac OS  (to Sonoma)  in Excel changed: 

• the character used to separate thousands and decimals after office
• format of the date

In general the regional setting changed from EU region to US region. That happened only for Excel (Apples Numbers respect the OS native setting). 

Here is more info: 

• Excel for Mac version 16.78.3
• Macbook M1 Pro, Sonoma 14.1
• I tried to reinstall MS Office - did not help

Here is my regional setting from system:

How and were can I set regional setting for Excel. Something like here.