Apparently I hit some shortcut combination that caused Slack to automatically collapse the sidebar that contains the list of Channels and Direct Messages.

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There is an option to temporarily show the Sidebar in the View menu:

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we now temporarily see the left sidebar

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But after clicking in conversation area the sidebar will still hide itself again.

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I have looked at Preferences | Sidebar and it does not have any setting related to hide/show:

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Is there any way to do a "factory reset" on the Slack settings but retain the existing channels? In other words I do not want to completely reinstall Slack unless necessary.

  • Have you asked their support?
    – Tetsujin
    Jan 12, 2022 at 18:52
  • 1
    What happens if you make the Slack window *wider?" Often apps will expand sidebars when there is more room for them to expand into. Perhaps Slack is like that? Jan 12, 2022 at 20:39
  • @SteveChambers ah! pls make that an answer Jan 12, 2022 at 20:47
  • In my case, I did have to make the window wider even though it already was rather wide. I had earlier expanded the Thread pane so that was occupying some of the screen real-estate. Personally, I think Slack should offer a standard "pin" icon on the Channels pane and let users decide whether or not they want to always show that pane rather than tie that decision to main-window width--something that has obviously confounded users who can't figure out why the channels pane keeps sliding away...
    – Jazimov
    Nov 15, 2022 at 14:31

3 Answers 3


There is now a setting for this in the Sidebar Preferences: enter image description here

Simply keep that unchecked to prevent the sidebar from collapsing if you shrink the Slack window.

  • This is the new correct answer Feb 15, 2023 at 13:06
  • This worked for me. In the top left menu bar, click Slack, then click Preferences, then click Sidebar, then scroll down to the bottom and do the above ^
    – Joel M.
    May 11, 2023 at 14:54

Often time, especially on the web and apps that use macOS to just wrap their web content into a neat package. Just making the window w i d e r (if it's a side bar instead of a top/bottom bar) will often make room for the sidebar to expand.

This works on youtube.com and I am wondering if that might be what is going on here as well...


This could also be because of zoom in. I had a similar issue and when used the default (100%) zoom, things worked fine.

You could find zoom option on top right(your image) -> Preferences -> Accessibility

  • View->Actual Size worked for me on the Windows App.
    – ΩmegaMan
    Aug 11, 2022 at 13:18

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