You can drag the Zoom slider to set the resolution for an external display. You can select Keep screen on when external display is connected to keep the display from turning off after a period of inactivity. The menu, Unity Touch sidebar, and keyboard bar of Horizon Client appear only on the device screen. If you use touch, a pen, or a mouse on the device screen, the input is mapped to the external display. You cannot change the orientation and full-screen mode on the external display, but you can change the orientation on the device display. The device shows a mirror of the external display with the same aspect ratio. When you enable this setting, a remote desktop appears on an external display based on the external display’s resolution. You can interact with remote desktops and published applications on the external display with the onscreen touchpad and full-screen touchpad.

You cannot change the orientation and full-screen mode. The Unity Touch sidebar is supported only on the client's internal monitor. When you enable this setting, Horizon Client extends a secondary desktop on an external display. You can use a physical mouse on the external display. The device detects the maximum resolution provided by the external display. The expanded touchpad and keyboard appear when you plug the device into the external display. When you enable this setting, a keyboard and expanded onscreen touchpad appear on the device when you display a remote desktop on an external display. When you click Enable display options and select Enable External display, you can use the following settings. You can use the External display options setting to configure settings for external displays, such as projectors and attached monitors. High Quality Mode is disabled by default.

The remote desktop or application must support the High Quality Mode feature.

If the client device has less than an extra-high density (xhdpi) screen, the High Quality Mode setting is not available.

You must log out and log in to a new session for the feature to take effect.

You cannot use the High Quality Mode feature for existing sessions.

The High Quality Mode feature has the following requirements and limitations. You cannot enable the High Quality Mode setting after you connect to a remote desktop or published application. To enable High Quality Mode, before you connect to a server, tap the Settings (gear) icon in the upper-right corner of the Horizon Client window, tap Display, and then tap High Quality Mode. You can use the High Quality Mode feature to obtain the best display quality in remote desktops and published applications. If you are not connected to a remote desktop or published application, tap the Settings (gear) icon in the upper-right corner of the desktop and application selector window. If you are not using full-screen mode, tap Settings in the menu in the upper-right corner of the Horizon Client toolbar. If you are using a remote desktop or published application in full-screen mode, tap the Horizon Client Tools radial menu icon, tap the gear icon, tap Display, and tap Resolution. You can use the Resolution setting to set the display resolution to a larger value. You can then tap and drag to access the edges of the remote desktop. You can pinch your fingers apart to zoom in and make the remote desktop larger than the device screen. If you use a larger resolution, the remote desktop still fits inside the client device, but the remote desktop and taskbar icons become smaller. Enlarging the Screen Resolution for a Remote Desktopīy default, the display resolution is set so that the entire remote desktop fits inside the client device, and the remote desktop icons and task bar icons are a certain size.

You can change the screen resolution that the client device uses to allow scrolling a larger screen resolution. When you connect a client device to an external display or projector, Horizon Client supports certain maximum display resolutions. You can use Horizon Client with external displays and you can change screen resolutions.

Zoom plugin for vmware horizon client