As seen here, a custom page of sorts has a button / link to create an entity

And when clicked, opens the entity's Quick Create Form in the same page

We are looking to do something similar.
Yet, when designing a custom page within the Canvas Apps editor, opening any Entity Form does not seem to be a functionality without using Launch(<formURL>) which is not desirable and also not an option for Quick Create Forms.
Have we missed something? What kind of page is this which allows this functionality? Any help is much appreciated.