Slack: switch back to the old experience (UI and theme)

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If you are struggling with the new UI in Slack application, and you’re running it on Mac or Linux, you can switch it back (may work for the Windows app too, I think).

Thanks to this tweet from @QuinnyPig.

1. Exit from the running Slack instance

2. Open a terminal, and set the SLACK_DEVELOPER_MENU variable:

$ export SLACK_DEVELOPER_MENU=true

3. Run Slack from that terminal:

$ slack &

4. On the running Slack window, press Ctrl+Alt+I (Command + Option + I on Mac) to open the Developer Console:

5. Run in the Console:

localStorage.setItem("localConfig_V2", localStorage.getItem("localConfig_V2").replace (/\"is_unified_user_client_enabled\":true/g, '\"is_unified_user_client_enabled\": false'))

6. Go to the Slack window, and press Ctrl+R to reload it – and you’ll get your nice-looking Slack back again:

If the code above doesn’t work – try with the following:

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