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At the bottom of the dialog you find three four options:
Question mark 
As we are rendering the create screen within our app, some fields might not be displayed. The affected fields are listed here.
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The dialog will close and all your information entered in the create form will be lost.
Configuring the Viable Issues Button
As mentioned above, the Viable Issues Button can be configured. Find all the details on the page https://hagen-management.atlassian.net/wiki/x/U4CHUg.
Use-cases
Viable Issues for Confluence Cloud can be used in various use-cases. Basically customers use it to quickly create Jira Issues without leaving Confluence. Have a look at our https://hagen-management.atlassian.net/wiki/x/IgCRUg page to read about the glorious use-cases of Viable Issues for Confluence Cloud inspired by our customers.