I’ve checked it on my laptop (Apple Silicon MBP).
The screen-oriented legend is not showing for me either (using the Metal display mode).
However, if I bake the visualisation set, the legend appears to the right of the chart as a grid element:
If I use the TestMetal command to set the viewport to the legacy OpenGL mode (this is a deprecated command, it won’t autocomplete anymore), it shows up, but then the other texts get messed up:
You just can’t have nice things on the Mac side these days. : )
There was a previous issue with Metal not displaying preview meshes properly in the viewport, but it was fixed long ago.
@wim was taking care of that problem, maybe he has a quick idea on how to resolve this one.
My setup for the testing
LBT 1.8
Rhino 8.9.24194.18122
macOS Sonoma 14.5 (23F79)
M1 Max MBP (Apple Silicon)