If you are troubleshooting SharePoint search that does work in general, bot does'n work for a specific list or library
(i.e. Search box not working),
and you already checked list settings -> advanced -> Search.. Allow items...
and you already tried to reindex list and site,
it's time to ensure that default item view form is in place and works ok.
Of not - just create a new display item form and make it default.
Here are some recent news, features announcements and links
on SharePoint and SPO from Minnesota SharePoint user group and SharePoint Conference:
Message center in Office 365 and a new reading role
Custom metadata integration with modern SPO pages and news
If you are adding a page to your Office 365 site via gerbox->"Add a page"
and a "modern-style" SharePoint page is created,
you still can have "classic" experience, i.e. Wiki pages or WebPart pages.
Just go to your pages library via "Site Content" -> "Site Pages",
then click "Files" tab and select "New Document" with dropdown option,
and this is where you can choose what kind of page to create.
"Радио Свобода". Отрывок из передачи "Деревенская жизнь художника Анатолия Стишко"
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What I did is:
User profile services -> Manage User properties: create custom property like "HideFromPeopleSearch", boolean, do not allow users to edit value, Indexed