Team Member 17.7 Cloud - How do I get old completed activities to drop off of "Add Activities" selec

My staff only has access to Timesheets in Team Member 17.7.  When adding an activity to a timesheet, completed activities show up on the selection screen, making the list extremely long to sift through to find and choose the In Progress activities.  Some of these completed activities go back several years.  I realize you can sort on the Activity Status column so that the Completed activities show up all together, but this is not the most ideal way to resolve this problem.  How do I set up Team Member to ensure that a completed activity does not show up on