Your showing the macOS System Preferences pane! Its equivalent on Windows would be the Control Panel. Do the Rhino Settings on Windows look like the Control Panel?
I’m talking about app-specific preference styles, where usually every body does what they want - hopefully in good taste -, but if you’re looking for a macOS “default” style, here are some references:
That could very well be an artifact of the bug itself, so I’d like to tackle that first and see.
Perhaps TMI: macOS uses a constraint-based system to layout dialogs - called Autolayout - that “inflates” and “deflates” dialogs “on the fly.” It looks to me like we have a macOS version-dependent Autolayout regression bug here. If Autolayout is broken on these dialogs, it’s likely macOS doesn’t know how to best animate the transition. But one thing at a time.