Yes, you can change all heat divisions during your competition and also in Phase 2.
If you change a heat division manually, you can drag and drop the athletes and then click "Save" at the bottom.
Make sure you then go to "New version" and not to the already published version. The already published version remains unchanged, in the New Version you will see your changes. And if you agree, you can print and publish that new version.
This has been automatically translated into English