About the Unit of Measurement
You can set the default unit of measurement for the structure as part of the measurement options. The default unit appears in the information panel. When the data is converted using an adapter or import filter, you can set an option to read and save the units of the original file. The default unit is applied when units conflict or the original units are not supported.
For an assembly, the unit of measurement of all components is the unit of the top-level assembly. For drawings, each drawing can have its own unit of measurement. As a result, when switching between the model view and the drawing view of a structure, the unit may change.
The display and the number of decimal places are default settings that can be changed locally for each view. Measurement precision is a global setting for all views.