How to remove page duplicates in Angular?

Question

Search Engine Optimization

There is a site https://p2y.com.ua/ on Angular
When you go to it, you get to the status page https://p2y.com.ua/#!/send
Page https://p2y.com.ua/#!/ send duplicates the page https://p2y.com.ua/
Question: How to securely route the page https://p2y.com.ua/#!/send to https://p2y.com.ua/ ? Programmers say that it is impossible to do this. https://p2y.com.ua/#!/send is the same page as https://p2y.com.ua/ only with an anchor that transmits the state of the page.
What other ways can you remove duplicates in this case? Maybe rel=canonical ?