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tmux popups can be sized how you like based on the % width of the terminal on creation by using the flags (h, w, x, y) for height, width, and position.
# normal popup tmux popup figlet "Hello" # fullscreen popup tmux popup -h 100% -w 100% figlet "Hello" # 75% centered popup tmux popup -h 100% -w 75% figlet "Hello" # 75% popup on left side tmux popup -h 100% -w 75% -x 0% figlet "Hello"