How to resize the canvas after a scene is over?

[Mrkd007]

I tried changing the width but unfortunately, the extra width becomes black in color. so please help me out to resolve this as soon as possible.

[JamesCraster]

What do you mean by a scene?
I've run into this problem, and I think I have a solution:

//In order to double the size of a 400x300 canvas after initialization:
g.stage.scale.x = 2;
g.stage.scale.y = 2,
g.renderer.resize(800, 600);

Stuff may look blurry as it has been scaled up, so for pixel art games you'll need to set
PIXI.SCALE_MODES.DEFAULT = PIXI.SCALE_MODES.NEAREST to maintain crispness.

Does this fix your issue?