(defun toggle-echo-area-visibility ()
  "Toggle visibility of echo area at the bottom of the screen"
  (if (equal (frame-pixel-height) (x-display-pixel-height))
      (set-frame-height nil (+ (x-display-pixel-height) (frame-char-height)) nil t)
    (set-frame-height nil (x-display-pixel-height) nil t)))



(exwm-input-set-key (kbd "s-o")
                    (lambda () (interactive)
                      (toggle-echo-area-visibility)))