If you are no longer collaborating in a project to which you have been invited and wish to have it removed from your Project View, you can leave the project. You can only leave projects to which you have been invited; you cannot leave a project you have created.
Three ways to leave a project:
1. Via a project thumbnail on the Project Dashboard
Right-click on any project thumbnail to reveal a dropdown.
Click "Leave
2. Leave Multiple Projects via the Project Dashboard
Click the thumbnail(s) of the project(s) you want to leave
Click the red Leave icon at the bottom-center of your screen
3. Inside a project via Project Settings
Inside any project you do not own or manage, click the button with the three stacked dots at the top right of the screen
On the left side of the modal that appears, navigate to the "People" section
Click the blue Leave Project button at the bottom-left of the modal