The gateway website has shortcuts for launching perspective sessions under Home ->Perspective->Launch, it would be nice to have a similar page for designer project, using deeplinks: https://docs.inductiveautomation.com/docs/8.3/launchers-and-workstation#creating-deep-links
So, when logged into the gateway site with an account authorized to access designers, the projects you have permission to edit will be shown, with a link/button to launch that project in designer.