Thanks for contacting Syncfusion support.
We understood that you are expecting Sidebar component in all pages of your application with List with anchor links to navigate to the other pages available in your application.
This can be achieved by rendering the Sidebar in the Master page(_layout.cshtml) of your application. We have prepared a simple sample with html list having li items with links to navigate to the other pages of the application.
Please, find the sample with latest version (18.104.22.168-beta) from the following link.