How to add a new page in Elsa Studio

[quytrieu37]

Hi everyone,
I’m trying to add a new page in Elsa Studio by creating a new page in the /Pages folder with the following code:

@page "/testpage"
@layout MainLayout
<PageTitle>My New Page</PageTitle>

But when navigating to that endpoint, the browser displays a message Sorry, there's nothing at this address..
I’m new to Blazor and Elsa Studio, any help or guidance would be greatly appreciated.
Thank you so much!