Slack Huddles: Share Your Screen Without Showing Messages

How screen sharing works in a Slack huddle

In the Slack desktop app, start or join a huddle and select the screen share control. Slack asks you to pick a screen, a window, or an app, and lets you turn on system audio if you need it. Then select Share. Up to two people in a huddle can share at the same time, and anyone in the huddle can click a shared screen to expand it.

Slack also lets people in the huddle draw on a shared screen with the pencil tool on the Mac and Windows desktop apps. That is handy for feedback, but it means viewers are looking closely at what you show, so prepare the screen first.

Sharing from the Slack mobile app

You can also share your screen from a huddle on your phone. Tap the three dots icon, then tap Share Screen. A phone share usually covers the whole phone screen, not a single app, so whatever you open next is visible.

Before you start, turn on a Focus or Do Not Disturb mode on the phone so banners from other apps stay quiet, and close apps you do not want people to see in the app switcher.

Share a window, not your whole screen

The choice you make in the share picker matters most. If you pick your entire screen, everything on it is visible, including the Slack window that is running the huddle. That window shows your sidebar, the channel you are in, and new messages as they arrive.

Pick the single window or app you want to show instead, such as a browser, a design tool, or a document. Slack stays off the share even while the huddle runs.

• Showing a document: share the document window only.
• Showing a web app: share the browser window with only the needed tabs open.
• Need to show Slack itself: open the exact conversation first and check the sidebar.

If you must show Slack on screen

Sometimes the thing you need to show is in Slack, like a workflow, a channel setup, or a bot. Plan the path before you share. Open the exact channel, close threads you do not need, and look at the sidebar the way a viewer would.

Mute busy channels so they stop moving to the top with new activity. Leave or close direct messages you do not want visible during the demo. If your team allows it, a separate test workspace with sample channels is the cleanest way to demo Slack features.

If you use Slack in Chrome instead of the desktop app, Safe Screen Share can blur parts of the page, such as the DM list or a private channel name, before you share the browser window.

Prepare the window you will share

Picking one window only helps if that window is clean. A browser can still show other tabs, bookmarks, and your profile picture. A document can show comments and the names of people who edited it.

Before the huddle, close tabs you will not use, hide the bookmarks bar, and open the exact page or file at the right spot. If you will switch between two apps, share each window in turn rather than falling back to the entire screen.

• Close unrelated browser tabs and hide the bookmarks bar.
• Resolve or hide comments in documents you will show.
• Open the exact page so you do not search on screen.

Pause Slack notifications before you present

Whether you share in a huddle or in another meeting app, pause Slack notifications first. In the desktop app, click your profile picture, hover over Pause notifications, and pick how long. You can also type /dnd with a time, such as /dnd 60 minutes, and use /dnd off to resume.

Paused notifications stop banners and sounds. People who message you see that your notifications are paused. A sender can still push one urgent message through per day, so a banner can appear in rare cases. A system-level Do Not Disturb covers that gap.

• Pause notifications before the share starts, not after the first ping.
• Set the pause slightly longer than the meeting.
• Remember to check missed messages after the call.

Hide message previews as a backup

If you forget to pause, previews are what cause damage. Slack can show banners without the message text. Open Preferences, go to Notifications, and in the sound and appearance options untick the setting that includes a preview of the message in each notification.

The banner will still show who sent the message and where. That is better than showing the message itself, but it is not invisible, so treat this as a backup to pausing notifications rather than a replacement.

Watch the smaller Slack signals

Even with banners paused, Slack can hint at private activity. The Dock or taskbar icon can show an unread badge. Sounds can play if they are not muted. And if the Slack window sits behind the window you present, a misclick can bring it to the front during a full screen share.

Quit Slack for a short presentation if you do not need it. If you are in a huddle, keep it running, share another window, and make sure the Slack window is not behind the content you present.

• Mute Slack sounds in Preferences under Notifications.
• Hide the Dock or taskbar if you share your entire screen.
• Close Slack windows you opened for other conversations.

Add a system-level safety net

Slack settings only cover Slack. If you also use email, calendar, or WhatsApp on the same computer, turn on Do Not Disturb or Focus at the system level before you present. It catches every app at once.

Then test. Share your screen to a test call or ask a colleague to send you a message while you watch. If a banner still appears, check both the Slack pause and the system setting.

Turn things back on after the call

Paused notifications are easy to forget. If you set a long pause, resume notifications with /dnd off or from the same profile menu when the meeting ends. Check direct messages and mentions you missed during the call.

If you muted busy channels only for the demo, unmute them so you do not miss work later. A short routine before and after each presentation keeps your setup safe without leaving you unreachable for the rest of the day.