how can I remove the white section on here? I’m not using any theme or anything. thoughts? I even am using remove tittle plugin. thoughts?

Can Anyone suggest a good carousell or slider plugin for this. I need a way to get a grid slider with the recet pictures shwon at the bottom. At the very least i want a grid slider with other imaegs being blurred but displayed at the side. the referrence websiet is - https://motwane.co/gallery