post colum grid- select each post manually

Yes that's it. The limited space below the box seems like part of the issue but not the entire one. I have a large screen. Thanks for looking into it.

Yeah, it happens if the pop over modal hits the browser edge for me.
I have raised it as an issue for improvement.
As a note in that select box you can type in the top field to search for the specific post. Does that help overcome the issue you have with selecting the right posts ?

Yes thanks, I'm good.

Glad to hear that! And thanks for the feedback, we'll address that issue asap.