How do I set up this poster printing properly?

Hello there,

I want to print an A2 poster in two A3's, my question here is, how can I make adobe to print it in JUST two A3's?

I set up poster printing, but I cannot find the way to let Adobe know I only want to print in 2 A3 pages not 4. Image below for explanation.

I would like the poster set up to be like the one showed in 'Size' menu:

You see, two A3's for one A2, how do I get that in 'poster' menu?

Thank you.

EDIT:

Seems like if I select 99% in Tile Scale instead of 100% it prints only 2 A3's. But seems extrange to me.