The lower right of the grid shows the spacing with a little <----> dimension with 10 cm on the spacing, but I have explicitly set my default unit of measure to mm with: @settings(defaultLengthUnit = mm)
The grid size will change and indicate what scale it is at. As you can see in my example it is displaying metric and imperial which is even more confusing.
I think at a bare minimum we should resolve the confusion of metric vs imperial when looking at the grid scale vs the unit of measure in the KCL.
I do not think it is inherently wrong that the scale of the grid changes? This can be reassessed.