Time entries made on the timesheet are by default sorted by the time entered on the timesheet. The time entries can be sorted based on the project names as well. In order to do that, you need to click on the hyperlink available when you take your cursor on Project in the project column header on the timesheet. Once you click on this, the time entries made will be sorted based on the projects against which time has been entered.

 
Note: This feature is not available on the Standard 2.0 timesheets of the new smart interface since this is not applicable for its new intuitive design.