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I don't think this can be done. I'm using the latest version of Office 365. I also tried Shollybee's direction and it does not work. Using a split at a cell position lower than A1 and any vertical position creates the four quadrants with two vertical and two horizontal scroll bars. The horizontal scroll bars will independently scroll each section to the left and right. The vertical scroll bar will scroll both screens up and down dependently (in sync) not independently. Moving the spit bar to the top row eliminates the top scroll bar resulting in only one vertical scroll bar.
Sholllybee, have you tried your method? I tried what you've indicated several times and cannot get it to work; it works as I've described above, which is there's only an independent horizontal (left and right) scroll option. Vertical scrolling only scrolls both screens. I remember this working on an earlier version of Excel. Any further clarification would be greatly appreciated!