Select Hidden results under VIEW…I do not know what version of SLP you are using
Go to Settings/View
You will see a dropdown box Gallery style, go to that dropdpwn and see if you have the Hidden results layout available for you to select from. I have it on my site but I do not know if all the different CSS styles are available on newer versions. Some of the styles require one r more add-ons.
Alternatively you can write your own CSS that works best with your them if you have the experience add-on. Premier subscription provides even more and the developer might be able to add a gallery style for you if you are a Premier subscriber and if it does not require a lot if additional customization.