This members-only tutorial provides the steps to register a custom condition in Oxygen using which elements can be output on the front end only if the current single page being viewed is a child i.e., has a parent.
This works on single views of any post type in WordPress.
It is also possible to check if the page is a parent page by selecting the false operator.
Step 1
Install and activate Code Snippets plugin.
Go to Snippets > Add New.
Title: [Condition] Is Child?
Code: