ViewCompanion Standard with ribbon based user interface (dark theme).

The detail magnifier is visible to the upper right and the layer control is displayed to the left.

ViewCompanion Standard with ribbon based user interface (default theme).

The markup and annotation tab is active and the project pane is displayed to the right.

Comparing two plot files in ViewCompanion Standard.

Changes are marked with red and blue colors.
Both plot files used in this compare are included in the installation.

ViewCompanion Standard with the classic menu and toolbar based user interface.

Both the detail magnifier and the reference window are active in this screenshot.
You may easily change to a classic style user interface if you doesn't like the Ribbon interface.
Please read more here.