How to modify results.php to hide just ONE category from initial search results

Hello

I am trying to figure out a way to hide just ONE specific category from the results on the initial page load where I am using a checkbox filter. I’ve seen the solutions/support posts to hide ALL results on initial page load, but I want everything (else) to appear when the page loads, except for just ONE specific category. If the person checks that one category, they can then reveal the items within that particular category, but initially I want the posts from that category filtered out/hidden, but the checkbox option for that category to still be visible so someone can choose it.

hope that makes sense!