Need a plugin to give me containers with thumbnails!

Hello!
I’m using a plugin named “WP links page” and it does what it should apart from the fact that it doesn’t allow me to change the thumbnails of the links I’ve chosen.

Is there an alternative way to do this?

Here’s a link to the page which shows what I want to accomplish without the custom thumbnails.
https://tusenskona.fi/sv/galleri/

Thank you in advance, and have a good day!