UI Toolkit for Runtime [Unity] 8/10 - Switching menu screens

Create a runtime interface of a simple game, using UI Toolkit - UIElements.

In this lesson:
- Creating a settings screen
- Switching between it and the main menu screen

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Unity introduced the UI Toolkit (previously called UI Elements) to move
from the current UGUI and even older IMGUI to a new system,
based on standard web technologies: CSS and XML.

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● Why learn UI Toolkit now?

It is still in a beta version, but you can already prepare for the future.
Unity has decided this new system will eventually become the main supported framework,
both for runtime and in the editor.

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● In this tutorial you will:

- Learn the basic concepts of the modern UI framework, based on CSS and XML.
- Discover UI Builder to create UI documents and styles.
- Implement interactive elements, like buttons and labels.
- Create simple transitions between panels and screens.
- Learn how to connect data with the interface elements.

This tutorial is based on one project.

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● Why learn from me?

I have been a Unity programmer for more than 5 years and delivered over 20 different projects.

I know how difficult it sometimes is to implement
new frameworks and technologies introduced by Unity.
Especially the ones that are still in a beta version.

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[seteta]

I can't seem to copypaste things from one UIDocument to another

[martindubois]

dislike because you keep using component in ui toolkit. the main purpose of such ui is to avoid component