Break-pane is a handy tmux command when your layout gets too cramped and you want to just move a split into its own window. Calling break-pane does exactly that, it creates a new-window for you and moves your currently selected split into that window

Default key binding for break-pane


bind-key          ! break-pane

tmux-nav-2021

for more information on how I navigate tmux, check out this full post