Sample Scene: Main Canvas Tabs don't work in CanvasExample.scene

[IssueSyncBot]

Original issue opened by:

@AMollis

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Overview

The tabs in the main canvas of CanvasExample.scene don't work.

Repro

1. Open CanvasExample.scene
2. Click a "tab" in the main canvas
3. Nothing changes in the main canvas

Excepted

The main canvas to change in some way when selecting a tab, for example images to change.

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ISSUE MIGRATION

Issue migrated from: microsoft/MixedRealityToolkit-Unity#11517