I am using SharePoint online modern team site. I have created lists and libraries under that site.
When anyone searches from the SharePoint search bar from the SharePoint ribbon it returns SharePoint lists and libraries data.

I need to exclude specific list items from the search. The search results should not return the data from the specific list. I have tied as mentioned in the below link but it is not working as expected.

https://support.microsoft.com/en-us/office/enable-content-to-be-searchable-d7ba92db-8618-43fe-87ee-adf03d973062#__toc355013925

Does it take some time to crawl?
Is there any other way to achieve the same?

Thanks