Split window - remove split
Splits the spreadsheet window into two panes, or removes this split. This command is only available when the spreadsheet window is open and active (on top).
The spreadsheet window can be divided into two panes. The two panes scroll together vertically, but can scroll independently horizontally.
To split the window into panes:
After you have performed one of these actions, the Split box changes into a Split bar dividing the spreadsheet into two panes. You can change the position of the Split bar by dragging it to the left or right in the window.
To remove the split: