Hello Erdevil,

you can select user groups or multiple users, only if
you are using the WinCC/Audit option,

see manual "SIMATIC HMI WinCC V7.5 SP1 WinCC Information System"
Configuring an electronic signature

https://support.industry.siemens.com/cs/ww/en/view/109772961/125861029131

5.If you are using the WinCC/Audit option, you can select user groups or multiple users.
Link the users and user groups using "and" or "or". You can group the rows in the "Group" column.

Regards

Georg Berghof

Hello Erdevil,

see the FAQ:
"Security settings in WinCC"

https://support.industry.siemens.com/cs/ww/en/view/109771268

Document "109771268_Sicherheitseinstellungen_in_WinCC_DOC_en.pdf"

part 3.4.2 Electronic signature and 4 eyes principle

Note:
When using WinCC Audit you can specify multiple users and/or operator groups
in the step who must confirm a change of the value. The configured
users/operator groups can be linked with logical operators (AND/OR).

Regards

Georg Berghof