System Configuration : Preferences : Editing Preferences : Zoom Toggle Section

Zoom Toggle Section
Vertical Zoom
Selects either Selection or Last Used for the Zoom Toggle Vertical Zoom setting.
Horizontal Zoom
Selects either Selection or Last Used for the Zoom Toggle Horizontal Zoom setting.
Remove Range Selection After Zooming In
When selected, the current Edit selection collapses into an insertion point after zoom toggling in. Zoom toggling back out reverts to the previous selection.
Track Height
Selects Last Used, Medium, Large, Extreme, or Fit To Window for the Zoom Toggle Track Height setting.
Track View
Selects Waveform/Notes, Warp/Notes, Last Used, or No Change for the Zoom Toggle Track View setting.
Separate Grid Settings When Zoomed In
When selected, the Grid setting stored with Zoom toggle is recalled when zoom toggling in. When this option is deselected, the same (current) grid setting is used whether zoom toggling in or out.
Zoom Toggle Follows Edit Selection
When selected, zoom toggle automatically follows the current Edit selection. When disabled, changing the Edit selection has no affect on the currently toggled-in track.