How do I set multiple different viewport sizes?

I am try to make a mini games game but I can't if I cant have different viewports

Why do you need different viewports?

If you're aiming for a picture in picture type mechanic, you can do it with a layer set with the force own texture property and a sprite object with a blending mode set to use as a mask.

i was needing them because im making a game that has minigames in it, and they needed to be different sizes, but i found out that i could just use set canvas size on start of layout