[Windows] Preferences - App Veil

To open your preferences, click your avatar at the bottom left of the Tuple popover and select Settings from the dropdown:

You can also use the keyboard shortcut ctrl+,. This will bring up the settings window. From here, you can select the App Veil tab:

In this tab, you can select the apps that you want to be hidden when you share your screen. Click the button marked "Add..." to bring up a list of apps on your machine:

Click the "Add" button next to an app to add it to the list of things to veil. If you need to temporarily unveil a veiled app, you can toggle it off via the main settings view:

When you share your screen with a veiled app, this is what you'll see:

...and this is what others on the call will see: