Ever wonder why certain Adobe InDesign documents open with Inches as the measurement unit, and other open with points, or some other unit? InDesign is smart enough to remember what measurement unit the document was saved with.
You can quickly change the unit of measure in a document by right-clicking anywhere in the document rulers and selecting your preferred unit of measure.
If you’re annoyed when you open a new InDesign document and the unit of measure is not what you prefer, you can set the preferences to always create new documents using inches (or any other unit you prefer). Simply close all InDesign documents and set your preferred unit of measure in Preferences>Units & Increments. From that point forward, all new documents will use that unit of measure by default.