Hi @aweissppg, happy to help clarify how the "Hide" functionality works.
Hiding a recommendation will remove it from the view, but won't improve your SEO. Hidden recommendations will stay hidden even if you rescan your site. You can unhide recommendations at any time.
If you select multiple items and hide, it doesn't show you the prompt, but if you click one at a time it will give you more insight:
When you hide an issue, a link appears at the bottom of the page below the pagination that will let you unhide anything that's been hidden.
If my reply answered your question please mark it as a solution to make it easier for others to find.