How do I create a split screen to view text on right side of split screen and and edit text on left side of split screen

Background: I have been in communication with a job prospect. we have emailed each other and entered contract negotiations. The negotiations are now complete and we have a mutual understanding and I am trying to prepare an Memorandum of Understanding based on the negotiations we completed.

Process: All communication has been copied and placed in LO writer. Ultimately, I want to submit a Memorandum of Understanding (MOA) from this process.

Question: How do I create a “split screen” feature to compare text responses on one side of split screen and create a new text document my of understanding of the agreement on the other side of the split screen.

Not possible:

Bug 31481 - [RFE] Split pane in same window for side-by-side proof reading/ translating of 2 different files

You need to open both document on separated windows.