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Troubleshooting

Some tmux versions don't enable extended key support by default. Without it, key navigation keys like Ctrl+h won't be forwarded correctly and you won't be able to move between panes (e.g. back to the schema panel).

Fix — add this to your ~/.tmux.conf:

set -s extended-keys on

Then reload:

tmux source-file ~/.tmux.conf
tip

If on doesn't fix it, try set -s extended-keys always instead. This forces extended keys unconditionally and works on terminals that don't properly advertise support.