how to change layout size?

hii everyone can anyone has a idea of how to change layout size(not a canvas size) in run time like when i press a dedicated button then layout size increases

I don't think it's possible. Why do you want to change it? Layout size is mainly used for scrolling and in behaviors like Bound to Layout, Destroy Outside of Layout. You can add a pair of variables (LevelSizeX, LevelSizeY) instead and do scrolling and other things with events.

thanks man i got it