[SOLVED] Canvas Scaler inspector warning "non-root canvases will not be scaled"

Hi,

I have many canvases nested within other canvases to achieve a better performance. Root canvas always has a scaler with "Scale with screen size" setting. But when I launch my game with a resolution that is lower than the reference resolution that is set within the Canvas Scaler component, then the GUI in nested canvases is not scaled at all and looks horrible.
When I tried to add canvas scaler components with the same settings on the nested canvases as well, then it looks good, but...

[SOLVED] Canvas Scaler inspector warning "non-root canvases will not be scaled"