Final answer:
To disable access to a specific Salesforce app for a group of users, you would update the profile settings or permission sets, depending on the needs for granularity and the users' existing profiles.
Step-by-step explanation:
If you need to disable access to a particular Salesforce app for a group of users, you would need to make this change in a. Profile settings or b. Permission sets. Profiles in Salesforce are a key component in defining what a user can do within the platform. Permission sets allow admins to grant additional permissions to users beyond what's allowed by their user profile.
By adjusting the profile, you can restrict access to the specific app for all users assigned to that profile. If the users are spread across different profiles or you want more granular control, you could use permission sets to either add or remove access to apps for individual users or groups without altering their main profile.