open external url from sitemap

Hi all,

I need to open external url from Sitemap area (screenshot below) but no redirection on main CRM page.

For example if you navigate to "main > Training > Help Center" D365 opens training url (docs.microsoft.com/.../dynamics365#pivot=main&panel=enterprise?sitemappath=HLP%7cHLP_GRP%7cHelp_Resource_Center) on new windows and there is noting change on main D365 screen. 

I tried to open webresource and using javascript inside to open window (js :  window.open(url);) however webresource displayed on man D365 screen and also open my external url.

If I try to give training page url (go.microsoft.com/.../p) to my navigation item, its icon and url changing automatically and working perfectly :)

I'm also modify my url to "http://MYEXTERNALURL/#pivot=main&panel=enterprise?sitemappath=SFA%7cMyWork%7crms_applicationcenter", but nothing changed.

How can I solve this issue?