This toolbar controls some of the view settings for the Valve Hammer Editor.
Toggle
Grid, Toggle 3D Grid -
These toggle the grid on and off in the 2D and 3D views.
Smaller
Grid, Larger Grid - These
decrease and increase the grid size. The [ and ] hotkeys can also be
used for this purpose.
Load, Save Window State - These
buttons are used to save and restore window configurations when the
independent window configuration is being used. Independent window
usage can be enabled or disabled in the General options.