Well, in that dialog box, set the discipline to "Common" and change the Length parameter to a metric unit.
I guess I do not understand.
If I change the units to meters ,Just same changes.
I want all units to metric changes, simultaneously, Like, area, volume, size pipe ...
Oh, no, that's not going to happen like that. Because each set of units has choices, preferences. Such as centimeters, milimeters, meters, etc.... How could Revit "know" all your preferences for each type of unit?
Or, simply use a metric template to start your projects.
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