• Select Text: copy from the terminal to your device even while tmux, vim or htop has the mouse. Tap Select Text, drag to select, two fingers to scroll, then Copy.
• Copy from your server: turn on Allow Copy to Clipboard for a host, and copying in tmux or vim lands on your device's clipboard. Shell SSH shows each copy as it happens, and a host can never read your clipboard.
• On a Mac, Ctrl and Option shortcuts now reach the shell: Ctrl-C, Ctrl-A, Option-B, Option-Backspace and the rest.
• Shift+Enter starts a new line in chat-style command-line tools instead of sending. You can turn this off in Settings → Terminal.
• iPhone Duo: Shell SSH supports Apple's foldable. Closed, it's the iPhone app you know. Open it, and you get the iPad layout: your hosts beside the terminal, two shells side by side, and Focus mode. It switches as you fold and unfold, and your open sessions carry over.
• Split view on the Duo's inner display works upright too: two terminals stacked, each the full width.