You should open the browser’s developer tools (e.g. Right Click > Inspect) and select the Network tab then reload the page. Filter by DocumentTree
and find out why the request fails. Check also the Console tab to see if there is any JavaScript error.
I assume you restricted some access right, including the XWiki
page most probably. It’s not enough to have view right on the Panels.Navigation
page. You also need to have view right on the wiki pages that hold the tree code: XWiki.DocumentTree
and XWiki.DocumentTreeMacros
. But these also depend on XWiki.SuggestSolrMacros
for search / filtering.