Invert luminance in Dark Mode
Currently, Dark Mode changes the UI, but not the document area, which is most of the app. Consequently, Penbook is more comfortable than GoodNotes when I want to scrawl out an idea I woke up with at 3AM.
RGB color inversion usually looks terrible, but preserving hue and saturation while inverting luminance (brightness) in HSV space typically preserves contrast and color-coding while providing the sentiment of “dark mode”.
Could luminance inversion in the document display area be an option for Dark Mode?

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Vaughan commented
Please add this! Most of my time using Goodnotes is using at night in the dark… every other app that I use automatically offers this. I can’t believe this isn’t an option. I hunted for ages thinking surely this is a feature I’m just missing it?
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Daniel Dosen commented
If One Note and Apple Notes see this as such a high priority that they've already added it, why is Goodnotes not seeing this as a high priority?
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Lukas Mauffré commented
Totally agree with you
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Igor commented
I am agree with you