Cancel all open orders
Cancel open pulls every open order at the broker in one action — WORKING and PARTIAL alike, in the active environment. It stops orders that haven’t executed yet; shares you already hold are untouched.
The confirm
A confirmation window lists what’s about to be cancelled before you commit (or ⌘⇧X opens the same confirm). Each cancelled order lands in the Orders table with the USER reason, and the kill-switch action is recorded in your audit log and sent to your enabled notification channels.
Partially-filled orders
Cancelling a PARTIAL keeps what already filled (those shares are a position now) and cancels the unfilled remainder — exactly how the broker itself treats a cancelled partial.
Pairs well with Pause
Cancel open without Pause leaves auto-execute free to submit new orders on the next run. When the goal is “nothing in flight and nothing new”, hit Pause first, then Cancel open.