If your organization adds new users between updates, they will need to be added to the existing Winter '21 Permission Set.
- As an Admin, click the setup cog in the upper right corner, and go to Salesforce Setup > Users > Permission Sets
- Locate existing permission set Winter ‘21 Features Access > Click
- Click Manage Assignments
- Click Add Assignments
- Check all Users
- Users who have already been assigned this permission set will not be assigned; however, it is easier to simply select all Users, rather than scroll through and select only the new ones.
- Click Assign