You can delete a custom routine you made. The steps differ a little by device.
On Android
Open the routine, tap the menu icon in the top right corner, tap Delete Routine, then confirm.
On iPhone
Swipe left on the routine and tap the delete (X) icon, or press and hold the routine and tap Delete Routine. Then confirm.
Good to know
This only deletes custom routines you created. Bend's built-in routines can't be deleted.