
Slack is a messaging app that helps business connect people to the information they need. By bringing people together to work as one unified team, Slack transforms the way organizations communicate. With Slack, you are guaranteed a more connected, flexible, and inclusive way of working. Furthermore, Slack organizes conversations into channels, where everyone can come together in one place to share ideas, make decisions and move work forward. It helps teams operate faster and stay in sync, wherever they are. Here are some related guides: How to delete your Slack account, How to deactivate a Slack workspace, How to stop Cisco Webex Meetings from starting up automatically on macOS, How to integrate WordPress site with WP Telegram, and How to update Zoom Desktop Client on macOS.
If you wish to restrict a user without having to remove them from Slack, the best option is to restrcict them. In doing so, you will have to deactivate their accounts. In this guide, I will be showing you how to deativate and reactivate a Slack user. Here are some guides you may be interested in. How to install and configure Microsoft Teams on Ubuntu, and Slack rolls out new Clips Feature for Users to record and send short Video, Audio Messages
Accessing Your Workspace and Navigating to Workspace Settings
Furthermore, Launch the Slack desktop app or open their web browser client and sign in to your workspace. Click your workspace name on the top-left side of your screen as shown below.

However, Hover your pointer to “Settings & administrations” and select “Manage members.”

Click the elipses (three dots) on the right of the member you want to remove from your workspace and select “Deactivate account” from the options that appear.
You can also change the Slack account type. By this you are managing their roles. Only people in administrative roles can manage roles for other members and guests.

Click the Deactivate button to confirm your actions.

As you can see below, the user has been successfully deactivated.
Note: This means, the app removes them from all your channels, signs them out of your workspace on all devices, and prevents them from signing back in.

When you deactivate someone’s account on your workspace, it won’t delete messages and files they previously shared on channels and direct messages. Also, it won’t notify them that you removed their access to your workspace.
Now that the account has been deactivated, if you wish to reactivate it. Please follow the steps below. But if you wish to remove the inactive members or guests from your workspace, kindly see this guide: How to remove a user from a Slack Channel
Reactivate a Slack User
If you ever change your mind, you can reactivate a member’s account to give them access back to your workspace. All you have to do is navigate to the “Manage members” page and enable the account from the list.

As you can see, the account has been reactivated back. With this step you will be able to deactivate and reactivate a slack user account.

I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.