Set the UCS preferences such as UCS prefix in the browser or the UCS visibility in the graphics window. Settings apply to newly inserted UCS.
In a part or assembly document, click
Tools tab
Options panel
Document Settings
Modeling tab in the dialog box. Click Settings in the User Coordinate System area.
Sets the UCS prefix. UCS name is generated from this prefix and a numeric index.
Select the default 2D sketch plane. Affects the behavior of 2D Sketch and View Face commands, when UCS triad is selected as an input.
Select the visibility of UCS objects.