Visibility of Webpart

Hello Jindriska 

you can define audience targeting for content in different web parts in SharePoint. Here you can find more information:

https://support.microsoft.com/en-us/office/target-content-to-a-specific-audience-on-a-sharepoint-site-68113d1b-be99-4d4c-a61c-73b087f48a81

OOTB ist not possible to hide web parts based on user groups. 

Best, 

Dave