Make Storyline block bigger in Rise 360

Hi all,

I created a course in Rise 360 and used some Storyline blocks in different chapters. One of those blocks has a tutorials and when I imported it into Rise, it is smaller than what I expected. So I wonder if there is a way to make storyline blocks bigger in Rise that they fill out the space completely without having the white surroundings in Rise 360? Any suggestions? Thanks in advance!

Cheers,

Bahareh