By default, a project owner is the person who created the project.
You can see who the project owner is from the project home page and "Edit project" in any project.
What can a Project Owner do?
The project owner can decide the permissions around editing project members.
The two permissions levels are
Any project member can edit project membership
Only the project owner can edit project members
How to change the Project Owner
The current project owner and workspace admins can change project owners. To do so:
Click on "Edit" from project home, or go to Edit project from the project more dots and click on the edit icon next to project members.
Go to the row of who you would like the new project owner to be, and use the access dropdown to change them to project owner.