ClimbPro currently only appears on a course sent to the device: https://support.garmin.com/en-AU/?faq=KKRLD2Fo6MAlCXOzUZb1e9
“The ClimbPro feature helps you manage your effort for the upcoming climbs on a course. Once a course is created and sent to your compatible device, ClimbPro allows you to view details about the climbs before and during your ride, including the number of climbs, when they occur, average gradient, and total ascent.”