re: strange that the manual doesn't mention it.
With 600+ commands and only one person writing "the book", some things do get left out. IMHO, they could do a better job of informing her of what gets which tools.
re: I suppose each dimension could go on its own layer, at the same physical location,...
I like this idea better than mine. With your idea, if you move the object, both dimensions follow. With mine, only one follows.
If you set the Text for one dimension style to Above and the other style to On Line with an Adjustment to -1, you can get it to look like the Pro version. Even better than Pro because you can specify two different colors. In some situations the Text does overlap, but it can be moved by using the Edit Tool, or by changing the Horizontal movement.
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Windows 10, 64-bit