Ruler does not work properly

Operating system: MacOSCatalina Version 10.15.7
Slicer version: 14.11.20200930
Expected behavior:
Actual behavior: Using the ruler shows no measure of my ROI. What am I doing wrong?

I think this is the expected behavior.
You see the value in the 3D window, not on the slice views.
Also, you can see the value if you switched to the Annotation module. You will see the length under the value.

Oh, I see! Thank you very much.
Could you at least please explain how to switch into Annotation module?

I would recommend to use the much improved “Line” markups instead of the legacy annotation rulers.

1 Like

thank you - this is great!!