Background colour for RTF notes

Sorry to resurect this old thread but I’m trying to do the same thing as the OP for much the same reasons. Age and eyesight make the glare from a plain white background tiring after a while.

However despite several attempts I haven’t manage to get the above to work. In the current DT 3 you can specifty the background color for new txt and rtf files. This works for plain text in a normal 3 pane view, but for rtf it only works in full screen. I can’t see a logical reason why, but there we are.

All I want is a straightforward blank rtf file with a tinted background: RGB 255 237 217 to be exact. Preferably with a default Helvetica font, that displays as such in a normal 3 pane view.

I’m using DT 3.9.4 on an Intel Mac with Ventura 13.6.4

Thanks for any help.