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WhatsApp Web: keep sidebar on narrow windows

Pins a minimum width for the chat-list sidebar so it does not collapse on narrow windows.

Code to copy

/* Keep the chat-list sidebar visible even on narrower windows */
#pane-side,
[data-testid="pane-side"] {
  min-width: 320px !important;
  flex: 0 0 320px !important;
  display: flex !important;
}
#main {
  flex: 1 1 auto !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.