If you, like me, hate the new "unified" Slack UX, try the instructions below. You're welcome. (From someone on Twitter/Reddit) 1. Close the Slack app 2. Open the terminal and run these two commands separately:

export SLACK_DEVELOPER_MENU=true
open /Applications/Slack.app

3. Slack will open with the new theme but now we have access to its console 4. Open Slack's console by pressing command + option + I 5. Run this in Slack's console (cone command):

localStorage.setItem("localConfig_v2", localStorage.getItem("localConfig_v2").replace(/\"is_unified_user_client_enabled\":true/g,'\"is_unified_user_client_enabled\":false'))

6. Restart Slack with command + R