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On-screen UI containers hold GuiObjects that you want to display on a user's screen.

Selling assets on GDevelop's Asset Store - GDevelop documentation

UI Documentation - Roblox Creator Hub

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Positioning and Sizing UI Objects Documentation - Roblox Creator Hub

Running Godot apps on macOS — Godot Engine (stable) documentation in English

UI Layout and Appearance Documentation - Roblox Creator Hub

Creating a Score Bar Documentation - Roblox Creator Hub

Roblox Creator Hub

Cocos Creator 3.1 Manual - Preview & Debugging

Concurrent Storage - Core Documentation

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UI Layout and Appearance Documentation - Roblox Creator Hub

Positioning and Sizing UI Objects Documentation - Roblox Creator Hub

Unity - Manual: Avatar Muscle & Settings tab

UI Layout and Appearance Documentation - Roblox Creator Hub