Two things: when I drag to select text in a Claude pane nothing gets selected, and ⌘C sometimes copies nothing. Also, how do I put a line break in a prompt without sending it?
Selecting while the CLI owns the mouse. While a CLI has mouse reporting on, a plain drag is forwarded to the program and selects nothing. Hold Option (macOS) — Shift on Windows/Linux — while dragging to force a text selection.
Copy that silently does nothing. Edit → Copy, the pane’s right-click Copy and ⌘C / Ctrl+C all copy the terminal selection. That selection is invisible to the operating system, so a third-party accessibility or clipboard utility running in the background — Typeless and similar tools that intercept the Edit menu or the pasteboard — can swallow the copy. If a copy does nothing, quit that utility, or exclude Navide in System Settings → Privacy & Security → Accessibility, and try again.
Newline without submitting. In a CLI pane, Shift+Enter, Ctrl+Enter or ⌘Enter insert a newline. In a plain shell pane only Shift+Enter does — Ctrl+Enter keeps submitting there, because that is what a shell expects. Plain Enter always submits.
These terminal keys are handled before the keybinding table is consulted, which is why they are listed read-only at the bottom of Settings → Shortcuts and cannot be rebound.
Source: docs/en-US/troubleshooting.md, docs/en-US/keybindings.md