How to change canvas’ size in unity3d

So may be my question should be how to change the screen size showed in editor?

To change the screen size, go to the Game window (accessed by the menu “Window->General->Game”). At the top of the window will be a screen size menu (outlined in green, below) to change the screen size. When pressed, it will display the list of screen sizes that will be emulated. I say “emulated” instead of “displayed” because it is possible to have a screen size larger than the screen on which you are working. It is also possible to zoom into a screen. The “Scale” slider (to the right of the screen size menu) will allow you to scale up/down.

As a note, the list of screens and resolutions shown are related to the current build target (accessed by “File->Build Settings…”). For example, common iOS screen sizes are displayed in the list when the build target is iOS.

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