Yes me also. We should be able to split vertically. Many people use their monitor in portrait mode and splitting horizontally gives 2 panes that are far too skinny - need the panes one on top of the other. Please add that!
Also, why are pinned tabs not inlcuded? It would be good to be able to use a pinned tab as one of the views, and have it return to it's previously pinned state (and position) when the user clicks 'separate tabs'.
Adding an option to split tabs vertically for vertical monitor layouts
With the new split tab option it would be cool if there was an option to split the tabs vertically instead of horizontally. Personally I prefer to have youtube or something open on my secondary monitor while I game or do something else and it would be incredibly cool if I could choose to show a video on the top of my screen and perhaps a guide or something on the bottom. Right now when I split it, it looks very strange and not practical at all, as seen in the attached file
I would call the current SPLIT feature vertical (splits the screen on either side of a vertical line) but however you call it, I agree that having the option to split top/bottom as well as left/right would be wonderful for those of us using spreadsheets -- even on a horizontal monitor.
When I want to compare 2 spreadsheets, I can open them in separate windows and reshape the windows to be short & wide, then position one over the other. But that means 2 title bars, 2 menu bars, 2 tab bars, 2 address bars onscreen all the time, using precious screen space (not to mention whatever title/toolbars required by my spreadsheet software). I'd much prefer to use that space to see more of my data at once.