Two Main Panels: one for writing, the second for ideas/searching

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Another workaround....

I do it this way...

Create a new text item.

Double click or Ctl-J to edit externally. That opens a window with my item in Word which I use for writing.
Navigate in UR to the item I want to take notes on and take notes into the new UR item opened externally.

Close Word and yes to save changes back to the UR item.

I normally use 2 monitors which makes this quite easy to do.