> For the complete documentation index, see [llms.txt](https://portalgraphvr.gitbook.io/portalgraph-document-en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://portalgraphvr.gitbook.io/portalgraph-document-en/how-to-use-portalgraph-app/external-monitor.md).
# External Monitor Settings
This page explains how to configure Portalgraph when using a 3D projector or similar device connected to your PC. When using a large screen such as a projector, a VIVE Tracker is used for viewpoint tracking.
Press **F12** while the Portalgraph application is running to open the settings screen.
In the **View Count** field on the right, enter the number of screens on which to display the Portalgraph view, then enter the display number for each screen (1 = main display, 2 and above = sub-displays; this depends on your environment).
**Click "Apply" to apply the values — changes will not take effect unless you click Apply. If the screen you are using changes, you will need to restart the application.**
**Offset and Scale do not normally need to be edited. Skip the following unless you need to restrict the display area.**\
Use these settings if you want to display the image in only part of the screen. Offset uses (0, 0) as the bottom-left and (1, 1) as the top-right; Scale ranges from 0 to 1 (same as Unity's camera viewport).
From the **3D** dropdown, select the 3D mode that matches your 3D projector or other display device.
* **Side-By-Side** — Left-right split 3D
* **Top-And-Bottom** — Top-bottom split 3D
* **Anaglyph** — Red-blue 3D glasses. The color split method can be selected from the dropdown on the right.
* **No 3D** — No 3D output
* **2 outputs** — Splits the left-eye and right-eye images across two separate video outputs. The left-eye image is output to the screen currently being configured, and the right-eye image is output to the screen selected in the sub-display dropdown.
After configuring, use the VIVE Tracker to calibrate the screen. For initial VIVE Tracker setup and calibration, refer to the [VIVE Tracker Setup Guide](/portalgraph-document-en/how-to-use-portalgraph-app/vive-tracker-guide.md).
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