I was reading this article about External users in SharePoint online:-
and the author mentioned the following limitation which external users will face inside sharepoint online:-
By default, external users cannot access the Search Center and will not be able to execute searches against “everything” (cross site collection search)
so i am not sure what is this limitation exactly, what is
"Search Center and will not be able to execute searches against “everything"? For example let say i as the site admin, create a dash board page using Content Search web parts, where inside the Content Search web-part i will be querying items/documents from multiple site collections, so will the external user be able to view and access those dashboards and their results?