Pinning has been replaced by Show in and Favorites.
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In combined mode, select Channels at the top of the Chat feed, or select Teams in the left pane.
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Select a team name and choose the channel to add to Favorites or another section.
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Select the More options (
) next to the channel name and choose Show in. -
Choose Favorites, another section, or create a new section where you want the channel to show.