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Try quitting Slack and just running this from the console.

It worked for me:

export SLACK_DEVELOPER_MENU=true

open /Applications/Slack.app

Instead of using open you can just run the binary inside Slack.app directory:

SLACK_DEVELOPER_MENU=true /Applications/Slack.app/Contents/MacOS/Slack

That's not a great idea. If you don't use open, the app won't show up in the Finder app switcher.

Good point! Thanks for mentioning that.

Small nitpick, though. The dock is what runs the app switcher, not the Finder.

That only works for the Bourne shell. Using `env` is more portable.