Background grid in BP editor is more prominent/visible than expected (thicker lines)

Seems to be an alpha issue. The only workaround I can find is:

Open Editor Preferences:

Search Bar, copy and paste: Grid Regular Color

Change the A to something around .5

Search Bar, copy and paste Grid Ruler Color

Change the A to something around .6

Search Bar, copy and paste Grid Center Color

Change the A to something around .5