CTRL
and LEFT CLICK
dragging on any viewport - up/down
to adjust Window Level, left/right
to adjust Window Width.
You see and/or modify the current Visualization settings by selecting the Visualization Panel on the top right of the tool bar.
When the Visualization Panel is open, its settings will display in the right hand Context Panel:
Creating a custom preset
Naming a custom preset
Updating a custom preset
left click
any part of a viewport to include it in the range or right click
to exclude it from the range.