Multiple Forms: Unions are not supported
The current version of the Multiple Forms extension can only perform a JOIN operation, not a UNION operation (yet).
How a UNION
works (not yet possible with GravityView)
It can't combine the information of two forms like this...
...into a View like this:
That's not possible!
How a JOIN
works
What the plugin allows instead is the following, known as a "JOIN":
Joining these two forms by the email address and outputting a View like this: