You can configure available activities for time tracking in Administration -> Time and costs -> Time tracking activities. You can activate or deactivate time tracking activities per project.

Time tracking is defined as a module which allows users to log time on work packages. Once the time tracking module is activated, time can be logged via the action menu of a work package.

To enable time tracking activities for a specific project, navigate to Project settings -> Time tracking activities.

Select the activities which you want to activate for time tracking in your project. Press the Save button to apply your changes.