Use

You will see a floating hexagon with the Stardust XR logo in the center, this is the hexagon launcher.

If you tap the middle of the hexagon, the launcher will open. Try dragging one of the apps with a pinch or grip. The small minus sign on your hand or controller is black-hole, if you tap it, it will grab any movable objects store it away. Tap it again and they will return to their original location.

Telescope is just a packaged version of a normal Stardust XR server, so feel free to launch any additional clients you want that match the telescope version!