Question How to stop Grid Layout Group changing size of children

Unlike a horizontal or vertical layout group, there does not seem to be a way to tell it to NOT change the size of child objects.

Layout element components are ignored and even if they did work I don't want to have to specify the size there, but just use the size already on the child object.

Horizontal + Vertical groups would not work for me.

How is this achieved?

Are there better grid layouts out there?