The Start menu on HoloLens is where you'll open apps and get to the HoloLens camera.
Bloom to Start
Wherever you are in HoloLens, you can always get back to Start by blooming. Usually, you'll bloom once to get to Start, but sometimes you might need to bloom twice.
When the Start menu is open, bloom to hide it.
What's on Start?
At the top of the Start menu, you'll see status indicators for Wi-Fi, battery, and volume, plus a clock. Just below that is Cortana—to talk to her, select her tile, or just say "Hey Cortana" from anywhere on HoloLens. The other tiles are your pinned apps. At the bottom you'll find the photo and video icons, which open the camera app.
To see the rest of your apps, select the plus sign to go to the All apps list. To get back to Start from the All apps list, select the minus sign .
Keep your favorite apps handy by pinning them to Start. In the All apps list, gaze at an app to highlight it. Tap and hold until the menu appears, then select Pin. To unpin an app, gaze at the app on Start, then tap and hold and select Unpin.
Uninstall an app
On Start or in the All apps list, gaze at the app. Tap and hold until the menu appears, then select Uninstall.