You can achieve this by working with the 'Multiple Windows' feature of the iOS13.
There are 2 ways to use this feature on the Noteshelf app-
- Open a Notebook
- Drag the Noteshelf app from the menu and place it beside the existing notebook
- Long tap on the Context menu or any notebook
- Select ‘Open in new window’ from the list
You can drag or add multiple windows and work simultaneously with ease.
Check out this blog to know more - http://club.noteshelf.net/noteshelf-on-ipados-and-ios-13/
We hope this helps, Happy Note-taking!