Horizontal radio button group is cluttered on macOS

https://github.com/openscopeproject/InteractiveHtmlBom/issues/452#issuecomment-2130729263

A minimally reproducible example:

import wx

class Frame(wx.Frame):
    def __init__(self, title):
        wx.Frame.__init__(self, None, title=title, pos=(150,150), size=(350,200))
        panel = wx.Panel(self)
        box = wx.BoxSizer(wx.VERTICAL)

        highlightPin1Choices = [ u"None", u"All", u"Selected" ]
        self.highlightPin1 = wx.RadioBox(panel, wx.ID_ANY, u"Highlight first pin", wx.DefaultPosition, wx.DefaultSize, highlightPin1Choices, 3, wx.RA_SPECIFY_COLS )
        self.highlightPin1.SetSelection( 0 )
        box.Add( self.highlightPin1, 0, wx.ALL|wx.EXPAND, 5 )

        panel.SetSizer(box)
        panel.Layout()

app = wx.App()
top = Frame("a")
top.Show()
app.MainLoop()

Upstream wxWidgets and wxpy (installed from homebrew, version 4.2.1 osx-cocoa (phoenix) wxWidgets 3.2.4):

KiCad bundled wxpy (started by /Applications/KiCad.app/Contents/Frameworks/Python.framework/Versions/3.9/bin/python3.9 example.py):

KiCad Version:

Application: KiCad PCB Editor arm64 on arm64

Version: 8.0.2, release build

Libraries:
	wxWidgets 3.2.4
	FreeType 2.13.2
	HarfBuzz 8.3.0
	FontConfig 2.15.0
	libcurl/8.4.0 (SecureTransport) LibreSSL/3.3.6 zlib/1.2.12 nghttp2/1.58.0

Platform: macOS Sonoma Version 14.3.1 (Build 23D60), 64 bit, Little endian, wxMac

Build Info:
	Date: Apr 27 2024 22:24:31
	wxWidgets: 3.2.4 (wchar_t,wx containers)
	Boost: 1.84.0
	OCC: 7.7.2
	Curl: 7.87.0
	ngspice: 42
	Compiler: Clang 14.0.3 with C++ ABI 1002

Build settings: