Thumbnail for search

Hi, first of all, thank u for making this wonderful plugin.
I’ve just installed it and finished the set-up.
But when I typed a few characters in the search bar, I couldn’t see the thumbnail for my posts. Also, the search results don’t show the thumbnail images tho the format of the posts is image. How can I solve this prob?

https://wordpress.org/plugins/buddypress-global-search/