Setting to allow PDFs to open as split pane by default

Request:
allow us to toggle a setting to always open editor and PDF viewer in separate panes.
Use Case:
I use the Close Pane shortcut regularly to manage my open panes.
As-is, whenever I use the shortcut to close pane, both the REM and PDF views are closed when my only intention is to close the PDF pane.
I would like to be able to close the PDF pane without closing the REM that the PDF is uploaded to. This is currently not possible with a keyboard shortcut.
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