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Slack: hide the right rail entirely

Hides the entire right-side panel and stretches the message area to the full window width.

Code to copy

/* Hide the right-side flexpane entirely for a wider message view */
.p-workspace__secondary_view,
.p-flexpane {
  display: none !important;
}
.p-workspace__primary_view {
  width: 100% !important;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.