Can’t add more than one child page

Hi there,

I am trying to build a page with the grid template so that all the child pages appear as boxes, similar to what’s by default in the front page.

The thing is that it only allows me to add one child page and not several, resulting in only having one box and being unable to add the rest of them.

Does anyone have any idea on how to add further child pages?

Thanks for the help!