If you are annoyed by clicking the UI by mistake when selecting objects in your scene you can disable the UI layer for the sceneview in the Layers dropdown. : r/Unity3D

How do I hide object in scene editor? - Questions & Answers - Unity Discussions

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How to hide UI Canvas without deactivating object? - Questions & Answers - Unity Discussions

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I'm trying to hide the left side of Hierarchy and I need some help. Anyone interested? : r/Unity3D

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Unity Sceve Visibility controls, [UNITY TIP] Thread on Scene Visibility controls. Use the eye icon in the hierarchy to hide/show gameobjects in the SceneView. Mouse click/H key to, By Demkeys