how to get featured image on recent posts?

i see featured images on what appears to be the recent post widget on the sample site here:
https://colorlib.com/travelify/

i only have one featured image on my site but none of my recent posts show the image.

This is achieved via plugin called “Recent Posts Widget Extended”, however, you can feel free to use any similar plugin. Most if not all at least somewhere popular ones will work with this theme.

thanks, looks great!