> ## Documentation Index > Fetch the complete documentation index at: https://docs.tuple.app/llms.txt > Use this file to discover all available pages before exploring further. # Sharing your screen To start a Tuple call, click the "Call" icon to the right of one of your contact's names:

Tuple contact list with the Call button highlighted beside an available teammate

**Note:** You'll only be able to start a call if the user is online and available (indicated by a green dot next to their avatar). Once you have started a call you'll be able to share your screen by clicking "Share screen":

Tuple in-call menu with the Share screen button highlighted

## Sharing part of your screen To start a call sharing only part of your screen, **right-click (or Control-click)** on your contact's name:

Tuple contact context menu with Share Part of Screen highlighted

If you're already on a call, you can share part of your screen by selecting the sub-option "Share Part of Screen":

Tuple in-call menu with Share Part of Screen highlighted

You'll then see a dotted line indicating which part of the screen you're about to share, along with a toolbar at the bottom of your screen. You can drag the handles of the rectangle to change its size, or drag the rectangle itself to move it around your screen:

A resizable dotted rectangle showing the selected part of the screen to share

The toolbar provides several options for adjusting your selection: * **Pick a window** — Click the window icon in the toolbar (or press `Space`) to enter pick-window mode. Hover over any window to highlight it, then click to snap the selection rectangle to that window's bounds. Press `Space` again to return to manual rectangle mode, or press `Escape` to cancel. *Note*: this just sets the screen share boundaries - if the window moves or gets hidden, the boundary won't change. * **Pin to half screen** — Click one of the directional icons to snap the selection to the left, right, top, or bottom half of your screen. * **Aspect ratio** — Choose a preset aspect ratio (16:10, 16:9, or 4:3) to optimize your sharing area for your pair's display. * **Resize without changing dimensions** — Hold `Shift` and drag a corner handle to scale the selection proportionally. Press **Share** once you are satisfied with your choices. You'll then see the red corners indicating what your pair can see:

Red corner indicators showing the active shared area after starting a partial screen share

If you'd like to change what part of your screen you're sharing, you can opt to "Change Selection" :

Tuple menu showing the Change Selection option while sharing part of your screen

## Sharing your screen immediately when starting a call If you'd like to share your screen immediately when starting a call, you can hold **alt** to toggle the call button mode. When **alt** is held, the call button will show the option to start a screen sharing call, which will share your screen immediately when your pair answers: