Start by locating the design that you want to turn into a template.

Click on the "Hamburger button," typically represented by three horizontal lines or dots, located at the top right corner of the thumbnail of the design you want to make a template from. This button will open a menu of options.

Within the menu, click on "Mark as Template."

By clicking "Mark as Template," the selected design will be added as a template and each time you create a new design, you will get this as a template option under Org Templates.