Control the position of the new window
From Vim Tips Wiki
created March 7, 2001 · complexity intermediate · author slimzhao · version 5.7
There are a few ways to open a new window (:help opening-window), but some users may not like the placement of this new window. By default, Vim opens the new window above the current one for horizontal splits, and to the left of the current one for vertical splits. You can customize this behavior like most other things in Vim:
make the new window appear below the current window.
make the new window appear on the right.
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