Toprevent Project Managers from creating Assignments, Resource Requests, or Milestones from the Gantt, theGantt Global Settingsmust be configured:

Navigate to Custom Settings→ Gantt Global Settings.

Modify the settingsto remove the ability for Project Managers to create Assignments, Resource Requests, and Milestones from the Gantt.

Save and apply the changes.

Option A (Project Task Gantt Global Settings)is incorrect because it does not control high-level permissions for assignments and requests.

Option C (Project Task Gantt Preferences)is incorrect because it only controls user-specific preferences.

Thus, the correct answer isB.

References:

FF-PSA-v15-Customer-Overview_1.0