Remove thumbnail in category page

Good day everyone! Hope you could help me please!

I used the Bootstrap Blog theme (parent theme) for my site thats still under construction.

I want the featured image to not show in Category page:

https://lovelustph.com/category/straight-stories/

https://lovelustph.com/category/straight-stories/

I tried messing with Additional CSS menu with codes I saw here in the forum. But it didnt work.

Please help me! I’m getting crazy over here.

The page I need help with: [log in to see the link]