No! Slack lets users log in to multiple channels at once. All you have to do is click the plus button on the far left panel of slack right under the close window button. To find more information on Slack settings click here.

No! Slack lets users log in to multiple channels at once. All you have to do is click the plus button on the far left panel of slack right under the close window button. To find more information on Slack settings click here.