Currently the PMUser site requires a minimum of 800x600 to display all of its assets located on the right-hand side of the screen (buttons, language and help links). On clients with such low resolutions, the product provides a scroll bar to facilitate the access of the referenced assets.
This is by design. An enhancement request (TF00491577) has been created detailing the feature: Make sure user interface is user friendly on window 800x600 px.
The product team will evaluate the request and this feature may become available on a future release of the product.