Revert to Startup Layout

Customize menu > Revert to Startup Layout

Revert to Startup layout automatically loads _startup.ui, which returns the user interface to its startup settings. This temporary system file is created automatically when you start the program. Use this option to return the UI to startup settings.

By default, 3ds max uses the maxstart.cui file to determine its startup UI. Alternately, you can specify a startup file at the command line by using 3dsmax.exe −c followed by the name of the customization file.

If you have Save UI Configuration On Exit turned on in the General panel of the Preferences dialog, the current UI file is overwritten when you exit the program.