Introduction:
It is not obvious on the DevTest RabbitMQ Connect asset how to change to a different Virtual Host.
Background:
RabbitMQ Server allows for multiple Virtual Hosts to be defined.
Environment:
DevTest 9.0.0 and later.
Instructions:
Choose the RabbitMQ Connection Asset in your project.config.
Click the second '+' and select 'Virtual Host':

This adds the field to the Asset. The default Virtual Host is already filled as "/", so change it to whatever you need.

Additional Information:
Not applicable