If you have finished your design in the Design zone, or need to come back to your design later, you can save your progress two ways:
1. Click on one of the 3 other zones (Home, Projects, or Control) on the top bar. This will show the following prompt, which gives you the option to 'Save and Continue':
2. Click save at the top right corner of the Design tab.
If you have finished your design and want to view the completed proposal, click into the Online proposal in the next tab.