How to make the UI display only in the center screen, and ensure that all screens respond simultaneously when the UI is clicked.

Development Rendering
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make the UI display only in the center screen

Anchor it to the centre of a canvas.

all screens respond simultaneously when the UI is clicked

Not sure what this means. You may need to clarify.

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这不是一件简单的事情。如果你只有这一个UI，下面的关键词可能对你有用。
公告板组件，屏幕空间，nDisplay同步组件