Head to your schedule > choose your team :
Click on the "Order employees icon" to see the list of your employees
Select an employee’s name and drag it to the position you want it to be displayed (or in alphabetical order !)
Click on save to validate
Good to know : Changing their order is only available on the 'View by employee'.
You can also reorder alphabetically or anti-alphabetically using the "A to Z" or "Z to A" buttons.