Underneath Settings → Services, you'll see the main Services screen where you can click into and manage all of your existing services or add new services for clients to book with you:
On this screen you'll find several features including:
After making any changes to your services (whether that's just editing a services duration or adding an entirely new service), it is a good rule of thumb to quickly preview your client facing scheduler to make sure your availability looks accurate. To do so from the Services screen, simply click the "Preview Scheduler" button in the top right corner:
This will launch your mini website on a new tab where you can click through your scheduler and check out your "Services" and/or "Time" panel to make sure that your appointment offerings and available time slots look correct for your different services.