Users are able to edit fields which are 'Read Only' as per Field Level Security or on the Page layout. This behavior is seen if the Profile associated with the User has 'Edit Read Only Fields' selected.
Note: Not all profiles have the Read Only Fields option. For example, the Salesforce License Type will have the 'Edit Read Only Fields' option under System Permissions while the Experience Cloud User licenses will not.
Salesforce Classic:
1. Click on Setup | Manage Users | Profiles
2. Open the Profile for which the permission will be removed
3. Navigate to Profile | System permission
4. Deselect the option 'Edit Read Only Fields'
5. Save
This will remove the permission to edit read only fields
Note: Not all read only fields are editable. System fields like 'modified date' and 'formula field' are still not editable, even with this permission.
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