The embedded Nintex Component for Salesforce only allows you to have 1 form on display per component on Salesforce.
It would be beneficial to have the component allow you to select which workflow you want and then load the starting form for the workflow.
Thank you very much for posting your feedback for our review. At this time, we will not be adding this request to the near-term backlog, as we are focused on other highly requested features. However, we reevaluate requests every quarter and will reach out if priorities change. Please keep the feedback coming as it is critical for our longer-term planning.