The Preview Window displays the selected controls' live preview with your theme applied. You need to build your project to enable the preview functionality. Click the F6 button to build your project.
The Preview Window allows you to interact with controls. Use the Reload Preview button in the ribbon to restore the default state of the preview.
You can preview an edited theme in the touch mode. Use the TouchMode option in ribbon to enable the touch mode.
The Navigation window allows you to select a required control to preview. The Navigation window provides a built-in search that allows you to find a required control to preview. The image below illustrates the search result for the 'menu' query.