To customize Time Entry, go to Setup → Time Entry → Quick Entry Field Set
TIME ENTRY TAB
1. Time Entry → Edit Quick Entry Field Set
Most fields can be custom configured, however fields with marked with ‘*‘ are required and hard coded into the page which means they cannot be changed.
2. Once the Field Set is open, fields can be added or removed by dragging and dropping from the panel above. The field order is the same that will display on the Timelines – Time Entry side panel tab and My Assignments – Time page → Time Entry fields
3. To make a field required: Select the tool icon → Check the box labeled “Required” → Click OK
4. Click Save
View Admin Guide: Configuring the Project Gantt