I've moved your question from feature requests to the general discussion forum.
I presume you mean the ruler units. You can right click a ruler and choose new units, right click the junction of the rulers and set both at once, or change the units in the preferences. If you change the units with no files open, they will become the default for new files.
You can right-click on the rulers to change units, or you can change them in the InDesign preferences.
If you change the preferences with no documents open, the new settings will apply to any new documents you make going forward.