As per the title description, there isn't an option now to create a page under a specific parent page. This can be a mess when you have an integration with JIRA whereby your sprint have ended and you would like to create a retrospective page and it redirects to Confluence then it does not give you the option to specify the parent page to be created in the space. As a result all the retrospective pages will end up under the home page of the Space.

The user would need to manually move the page in this case which is an extra step.