How to set up the size of the image for WP show post plugin

hello, how are you?

before: set full-width content for layout https://prnt.sc/su2x4x, the website shows https://prnt.sc/su2xr5, everything is normal
after: set full-width content for layout https://prnt.sc/su2xge, the website shows https://prnt.sc/su2yln

I m using WP show post plugin for this part, how to change/choose the size of the image and let them looks normal, not be out of shape when making the list of WP show post