To see measurements in the editor screens, make sure you have the measurements button enabled - in Shaper it is to the left of the pencil button on the right panel:

In Blocker it is the on top right of the group of buttons:

In Shaper, you can set the size of a particular shape by tapping on the box with the writing on it for any of the axes:

Hope that helps! Let us know if you have any questions!

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