Showcase Photos

Hello,

I just downloaded this theme and am trying to get my showcase photos set up. I have them selected and the titles however the pic sizes are all different. How can I make them the same like the demo?

Also, how can I get the featured posts below the showcase to only display 3 photos or one row because I did select 1 row but there is 5 photos 2 rows showing up.

https://www.mommasmeals.org/

Thanks!