PLEASE READ - This forum is not for uGUI (or Unity UI), or IMGUI

This forum is for UI Toolkit (formally named UIElements), which was introduced in Unity 2019.1 as new UI API that is currently only available for the Editor.
Docs: Unity - Manual: UI Toolkit
Namespaces: UnityEngine.UIElements and UnityEditor.UIElements

For uGUI, or Unity UI - current way to create in-game UI:
Forum: Unity Engine - Unity Discussions
Docs: Redirecting to latest version of com.unity.ugui
Namespaces: UnityEngine.UI and UnityEditor.UI

For IMGUI, or OnGUI() - pre-2019.1 way to create Editor Extensions:
Forum: Unity Engine - Unity Discussions
Docs: Unity - Manual: Immediate Mode GUI (IMGUI)
Namespaces: UnityEngine and UnityEditor

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