Customize menu > Custom UI and Defaults Switcher
Artists and designers in different industries use Autodesk VIZ in different ways. The Custom UI and Defaults Switcher lets you quickly change your program defaults and UI scheme to more closely match the type of work you are doing.
The Initial settings for tool options control the default settings for various features in Autodesk VIZ, while the UI Schemes control how the Autodesk VIZ interface will look.
The dialog displays a detailed explanation for each of the default sets and the default UI Scheme that ships with Autodesk VIZ. If you create your own defaults or UI Scheme, they will also appear in the list, however you cannot edit the general description of custom default sets or UI schemes.

Initial settings for tool options—This list contains different sets of default settings for various tools in Autodesk VIZ. Highlight the set that corresponds to the tools you are using.
Autodesk VIZ ships with two default sets:
Highlight any of these sets to see detailed explanations of the affected settings.
For information on creating or editing defaults sets, see Market-Specific Defaults.
Note: You must restart Autodesk VIZ before new defaults are applied.
UI Schemes—This list contains all of the UI schemes defined in the \UI folder. Autodesk VIZ ships with one UI scheme: DefaultUI. Highlight the name of the UI scheme in the list to see a description (and image) of the interface.
This list also contains any UI schemes you have saved with the Save Custom UI Scheme dialog. However, no description or image is displayed for these schemes.
Set—Applies the selected default settings and UI scheme to Autodesk VIZ.
Note: You must restart Autodesk VIZ before your defaults are applied.