1. Click on "Speakers" from the sidebar.
2. Click on the three dots visible on the speaker's profile.
3. Click on "Edit".
4. Set the priority number (Higher the number, higher the priority).
5. Click on "Save changes"
6. Similarly do this for the other speakers to set priority.
7. Set the priority and click on "Save changes".
Tip: Applicable only for speakers. Higher the priority, higher they will appear in the speakers list.