asp-page-handler how to load content in @RenderBody if the a tag is in a nav bar outside ?

Hi,

I have a nav tag from bootstrap and the div below with @RenderBody.

Inside the nav I have the <a asp-page-handler... Once clicked the content loads inside the nav and I can understand the reason.  but I'm looking for the way to load the content in the @RenderBody which is in the div below the nav tag.