Pixyz Review user interface is divided in several panels (also called windows), placed around the scene viewer. 

Panels give access to the tools and functionalities necessary to interact with the scene and its content. To switch from one panel to another, you need to click on the "Panel's Tab" located at the top right hand corner.

The interface layout (workspace) is entirely customizable to shape it as your liking.

List of all the panels : 

Dark Theme / Light Theme

You can as well decide to switch to Lightmode from the Window Menu. 

NOTE                You will need to restart Pixyz Review to switch correctly to Light theme.