when I start the workout app, the compass app prevents me from setting segments during run

If the Compass app is interfering with the Outdoor Run app on your Apple Watch and preventing you from recording workout segments, you can try the following steps to inactivate the Compass app:

1. Open the "Watch" app on your iPhone.
2. Scroll down to the "Compass" app and tap on it.
3. Turn off the toggle switch next to "Show App on Apple Watch".
4. Close the "Watch" app on your iPhone.

This should prevent the Compass app from appearing when you start the Outdoor Run app and allow you to record workout segments without interference. If you need to use the Compass app again, you can simply turn it back on in the "Watch" app on your iPhone.