This is how you do it without moving the events:
- Select all audio parts that you would like to put in musical mode
- Go to the audio menu (top left corner, next to project)
- Go to advanced
- Click on “Set definition from Tempo”
- Select “Save definition in project only”
- Select “Set all tracks to musical time base”
- Click on “ok”
- There you go
It’s also shown at the end of this video (starting at 05:30):
I hope that helps!