How to add

How to add a draggable Image Box to the building screen where it wont occupy the whole row but will make me add 2 more images box making them three in that row? then I can add more below it like add 4 so it makes like a nice blog article look with boxes of articles on display

as of now when i drag one image boxx it occupies the whole row -- when i add one more it goes to the next line below