Is there any way or any other dashboard node that allows multiple URL extensions?
Maybe node-red-contrib-uibuilder, you have full control over the ui experience
Always happy to answer questions on uibuilder.
Of course, the thing to note is that you have to build the page(s) yourself whereas Dashboard does a lot of the heavy lifting for you for many standard tasks.
But it does allow you to have any number of different pages on different paths. Even using different front-end framework libraries if you need them.
A single node supports multiple pages under a single main path, e.g.
http://127.0.0.1:1880/user/myfolder/page2.html though you only get a single websocket connection shared across them.