If there is another document tab in your Frase document that makes sense to have open as a read only in the sidebar, then the split view option can help. For example, you may want to reference your outline while still having the editable tab open for actual draft writing.
Click on the three-dot icon at the top of the document and select "toggle split view".
The read-only view will open in the right-side panel with an option to switch the view to any different tab in your document. 