What is the purpose of Transparent and Opaque in the Font tab of Display Option?
This is one of the functions that expresses the text on the screen.
'Transparent' makes the background of the text transparent to blend labels with the background image, while 'Opaque' makes the background of the text opaque to make labels stand out.
When using the Opaque function, you can change the background color of the letters with Background Color.
[Image-1] Font Settings Window of Display Option
[Image-2] Transparent [Image-3] Opaque