The View pane appears at the bottom of the translation editor - normally, below the Grid.

It can show one of three things:

A formatted or structural preview of the translated document (HTML Preview)

The quality assurance or linguistic QA warnings and errors in the current row (Review)

The active comments for the current row (Active comments)

To switch the mode of the View pane: Point at the View pane. Three buttons appear at the top right:

view-pane-modes

Click one of them to switch to that mode.

You can turn the View pane on and off. To do that: On the View ribbon, click View pane.

 

Translation preview

Review

View active comments

Put the preview on another screen - or put it back