Build once, deploy anywhere: https://unity3d.com/unity/features/multiplatform?utm_campaign=engine_global_activation_Onboarding%20beginners%20flow&utm_content=16-onboarding-beginners-community7

Industry-leading multiplatform support

There are so many platforms you can deploy to with the Unity game engine, and their number is growing all the time. Build your content once and deploy at a click across all major mobile, VR, desktop, console, and TV platforms plus the Web.

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Objects in Scene disappear when I zoom in

– Select the object you want to work on, and press F. This focusses the screen on the object you selected.

https://forum.unity3d.com/threads/objects-in-scene-disappear-when-i-zoom-it.134323/