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How to Keep Email, Slack, and Notifications Private During Screen Sharing

Every long-running team has a story about it. A demo to a client where a DM popped up saying something unflattering about the client. A salary discussion in Slack that appeared during a sprint review. A toast notification with a bank balance during a webinar with three hundred attendees. The fix is unglamorous: it's a checklist you run before every share, and a few one-time settings.

The two failure modes

Almost every "I shared something I shouldn't have" incident falls into one of two categories.

Notification leaks. A toast, banner, or sound from email, Slack, Teams, calendar, or the OS appears mid-share. The audience sees the contents.
Whole-screen leaks. You shared "entire screen" instead of a window, so anything you alt-tab to — or anything visible on your other monitor — gets broadcast.

Each has a separate set of fixes. Run through both before any high-stakes share.

Notification leaks: kill them at the OS level

Windows: turn on Focus / Do Not Disturb

On Windows 11: Settings → System → Notifications → Do not disturb. Or click the bell icon in the system tray and toggle DND. While on, notifications collect silently in the Action Center instead of appearing as toasts.

On Windows 10, the equivalent is Focus Assist (Settings → System → Focus assist → Alarms only).

App-level Do Not Disturb

Belt and suspenders. Set Slack's status to "Do not disturb." Mute Teams chat. Turn off email notification sounds in Outlook / Apple Mail / your client of choice. The reason you want both OS-level and app-level DND is that some apps (looking at you, Slack desktop) sometimes show banners even when Windows is in Focus.

Hide the taskbar's chat preview

If you hover over the Teams or Slack taskbar icon while sharing, a chat preview pops up — which the audience also sees. Habit: don't hover over those icons while sharing. Better: pin them to a different monitor.

Whole-screen leaks: share the right surface

Prefer "Window" or "Application" over "Entire screen"

Every major meeting app has both options:

Zoom: Share Screen → pick the specific window, not the screen.
Microsoft Teams: Share → Window.
Google Meet: Present now → A window.
Webex: Share → Application.

With Window sharing, the audience only sees that one app. You can alt-tab freely; you can read your DMs; you can switch between apps without anyone seeing.

When you genuinely need "Entire screen"

Some demos require it — anything where multiple windows interact, or where you're showing an installer, or where the audience needs to see file managers, system trays, etc. Those are the moments to be extra careful.

Strategy: share only one monitor (every major meeting app supports "share screen 1" / "share screen 2") and use the other monitor for everything else. Put your private content — email, Slack, notes, browser tabs — on the non-shared monitor.

Hide the non-shared monitor from view too

If you're in a shared room (coworking desk, open office, home office with kids), the non-shared monitor is still visible to people physically around you. For those moments, a selective screen lock like ScreenBlind covers the non-shared monitor with a password screen during sensitive moments — without affecting the share at all.

The 30-second pre-share checklist

Turn on Focus / Do Not Disturb at the OS level.
Set Slack / Teams / your email app to DND.
Close any browser windows with personal tabs (banking, password manager, gmail).
Decide: share a window or share a monitor — never "entire screen" by default.
If sharing a monitor, move private apps to the other monitor first.
Start the share, look at the preview, count one second of "what's visible to them right now."

What about screen recordings?

Same checklist applies, with one addition: clear your browser tabs before you start, and if your address bar shows URLs with company names or internal tooling paths, switch to a clean window. Anything captured to disk lives there forever — Slack videos passed around a team five years later sometimes still contain whoever had the recorder running's accidental tab bar.

The tl;dr

Whole-screen share + on-screen notifications + an open Slack window is how 95% of embarrassing screen-share moments happen. Disable notifications, share a window if at all possible, and put private stuff on a different monitor (or behind a selective lock). Five minutes of habit, zero incidents.