You can select your default Slack channel in your settings. This will help you to select the right channel from the list faster.

1. Navigate to the settings by clicking on your name on the top right of the app and choosing Settings for  <your website name>

2. Click on "Slack" on the menu on the left

3. In the settings menu, switch the default channel.

NOTE: Read this article to get a private channel shown here as well.

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