Mixed Reality
To setup a scene for HoloLens 2 follow these steps:
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Switch to Universal Windows Platform and apply the settings below.

After switching to UWP, the Mixed Reality Toolkit components are installed. In Unity, a new Mixed Reality menu is added. Then the MRTK Project Configurator is displayed.
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If the MRTK Project Configurator is not displayed automatically, you can manually open it in the menu item Mixed Reality > Toolkit > Utilities > Configure Project for MRTK.
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In the MRTK Project Configurator, select Unity OpenXR plugin.

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If the following window is displayed, click on the Apply Settings button.

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Now go to Project Settings > XR Plug-In Management and set as follows.

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In Project Validation fix all the issues that may appear, with the FIX ALL button.
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Go to OpenXR and apply the following settings.

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In the MRTK Project Configurator, apply the default settings.

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Save and restart Unity.
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Setup the scene with WEAVR.
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Disable the PlayerRIG from the WEAVR game object.
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Add the following MRTK objects to the scene:
MixedRealityToolkitMixedRealityPlayspaceMixedRealitySceneContent
WEAVR provides limited support for HoloLens.