Private browsing greyed out in Safari
The private window option is greyed out in Safari and the short cut doesn't work either.
[Re-Titled by Moderator]
MacBook Air 13″, macOS 15.1
That normally means you have Screen Time Restrictions in place and have limited the types of websites that can be accessed.
Check System Settings ➜ Screen Time ➜ (Restrictions) Content and Privacy ➜ App Store, Media, Web, & Games ➜ Access to Web Content and make sure it's set to "Unrestricted". Otherwise Private Browsing is disabled.