How can I change the units in perspective mode in Adobe Illustrator?

When I do a drawing for example, one rectangle on the left grid, the dimensions of the rectangle are shown in points (pt). But I want that these dimensions in inches. How can I change these dimensions. I tried the form Edit > Preferences > units... but nothing changes. My size on adobe Illustrator are given in pt and not like the following picture.

Display > Perspective grid > Define grid

Tags: Illustrator

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