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Tmux-popups are a great feature that is relatively new to tmux, many repos such as the standard ubuntu repos do not have it. Popups came in 3.2a, if your package manager does not have it, you can follow the tmux's install instructions to build from source.
# open a popup scratchpad bind -n M-g display-popup -E "tmux new-session -A -s scratch"
for more information on how I navigate tmux, check out this full post
I use popups quite a bit in my workflow to ssh into another machine for a short period, or make a new project with a template.