To find Project Settings, click the three-line icon in the top left corner to open the left side navigation. Next, find your project in the list and click the Gear Icon next to it and click Settings at the top.
For Business and Enterprise users, you can turn access to a project on for everyone in your GLIDR organization - or off so you might select which users have access to a project. Read about Project Access here.
NOTE: Deleting a project cannot be undone and all the attached data and files will be lost! Consider setting your project status to Archived instead.
To find out more about managing your Organization, click here.