Source: https://helloai.substack.com/p/how-i-forced-my-mac-to-run-2-instances
- Step 1 (Crucial)
- Completely quit the Claude Desktop app (Cmd+Q).
- Open System Settings → Desktop & Dock, and set “Default web browser” to Safari (or any secondary browser).
- Open Safari and log into Claude.ai using your Work/Enterprise account.
- Step 2
- Open your Mac Terminal and run this command to tell macOS to launch Claude, but build a brand new sandbox folder for it: