SPOnline trouble mapping crawled and managed properties

Question

I have created a list with site columns. In search schema, columns appear in crawled properties but i can't map them to any managed properties. Even refinable properties.

Modify/Map property action is not available.

Am I missing something, like a feature to activate ?

Environment : SharePoint Online. "SharePoint Server Standard Site features" and "SharePoint Server Standard Site Collection features" are active. I'm Site collection administrator. I can't access Sharepoint search administration.

Answer 1

I was cheated by my switch from SharePoint on premises to SharePoint Online.
I was not going to the right place.

url is like : tenant.sharepoint.com/sites/Site1/_layouts/15/listmanagedproperties.aspx?level=site

url is like : tenant.sharepoint.com/sites/Site1/_layouts/15/listmanagedproperties.aspx?level=sitecol