Select the project tile (See: How to create a project?) and click on the three dots in the upper right corner for opening the menu.
In the context menu, select “Delete Project”.
You can find all deleted projects in the trash can by navigating through the main menu under “Projects”. Find the trash icon in the left sidemenu next to the project board. (See: What is the project board?)
You can easily restore deleted projects by simply selet the particular entry and click on “Restore”. Now the project can be found in the project board again.