Designs made in the Create studio. The showcase is shared with everyone. My library stays in this browser only. Save a design from the showcase to your library, then open it in the studio to change it or copy the OBS address.
Whole esports broadcast packages made with Build your own package. Open one in the builder to download it or make it your own.
Logos are never sent to the showcase. Everything else in your design is: layout, colors, template labels. Your library itself never leaves this browser.
Share your whole library, or one design, with another streamer as a single file. They press Add from a file here, or Open a file in the Create studio. Your logos go along inside the file.