Rhino 6 Dimension is not working

Rhino Rhino for Windows
1

I tried to dimension, but it is not showing the dimension, only a rectangle（yellow

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2

maybe the text is too small compared to the model size, check the dimmension properties under rhino options.

3

… and if those setting appear to be fine and you still cannot see the dimension values, please run the Rhino SystemInfo command and post the result here.