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Here’s a li’l mini function for Emacs that when called sets the window width to one space wider than the current cursor position:

(defun cozify-window ()
   (- (window-width) (current-column) 1)))

By window, I mean the panels in side of the frames.
I mean the things that split up your Emacs into left and right when you’ve done C-x 3 even in the TUI mode of Emacs.