Design Area Toolbar
There is a toolbar at the top of the editor panel that allows you to control alignment of the visuals, as well as the appearance of the design area itself.
Report Web Editor - Toolbar
The toolbar provides two options; Alignments and Screen Mode.
Alignments
Alignments is only active when there is more than one visual added to the design (editor) area. When chosen, the Alignments option displays a menu that allows you to set parallel sizes (Size) and align (Alignment) two or more visuals.
Size
Size allows you to resize the selected Visuals.
Size settings options
Alignment
Alignment allows you to align two or more Visuals by their tops, right sides, bottoms, left sides, by vertically centering or by horizontally centering.
Alignment settings options
Screen Mode
Screen Mode allows you to choose how you want to view the report in the editor area. You can view the report at it's actual size, have it fit the width of the editor area or fit the whole report page in the editor area.
Screen Mode options