Why ‘Add Row’ button is seen instead of ‘Add/Remove task’ on the timesheet?

Scenario:
A user may not be able to see the Add/Remove Task button, even though the user is added to projects, is associated with tasks and sub-tasks of the project. This issue could be affecting multiple users.

Resolution:
If multiple users are facing this issue and they all have the same permission, then the permission has to be modifed. To edit the permission follow the steps given below:

• Log in as Administrator.
• Click on Administration tab in the top menu.
• Select Permissions under Users/Departments from the left menu.
• Edit the permission that is assigned to the users.
• Expand Timesheet under System tab by clicking on the (+).
• For the option Allow time to be entered in the drop-down menu change Without requiring a project to be selected to either Both or Against Projects.

Note: This should enable the Add/Remove Task button on the user's timesheet.