Not just the split screen.I would also rather have it on the bottom
I made an serious error when I upgraded from Endnote 8 to 20. I effectively payed lot of money to get a programe with reduced functionality and minimlal flexibility compared with Endnote 8.
All the single buttton press functions now require you to remember a host of different keystrokes plus the annoying black field on the left cannot be moved and just takes up screenwidth better used for reference lines.
In additoin there is a single default text for the appearance of refernces on the screen. For me the sceeen hadstoo much glare with spidery text agains ta white background.