Zooming into the current split in tmux is a valuable tool to give yourself some screen real estate. These days I am almost always presenting, streaming, or pairing up with a co-worker over a video call. Since I am always sharing my screen I am generally zoomed in to a level that is just a bit uncomfortable, so anytime I make a split it is really uncomfortable, being able to zoom into the split I am focused on is a big help, and also help anyone watching follow where
I am currently working.
Default key bindings for zooming the current split
bind-key z resize-pane -Z
I have rebound this to match the default binding with mod+z rather so that I get that single keystroke experience.
bind -n M-z resize-pane -Z
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Also check out this long form post for more about how I use tmux.