The order services appear on the schedule and the Schedule Widget depends on the time of the service and their order on their Setup menu pages by default. You can customize the order of your services by rearranging them on their Setup menu page.
Organize services on the schedule and Schedule Widget
To customize the order your services appear on the schedule and Schedule Widget:
Open the App Drawer
then click View All > Setup > Services.
On the Services menu, click Classes, Appointments, Events, or Book-a-Spot depending on the type of services to organize on the schedule and Schedule Widget.
Select Tile View.

To organize services by Name, Price, or Duration, click SORT BY and select the desired option.
Click Save.