1) GoodNotes icon and menu tab color theme (Document Tab color change)
: A theme option that allows changing the background color of the menu tabs, as well as the lined or highlighted UI elements used throughout GoodNotes.

2) Tab color theme feature (Menu tab background color change)
: An option to change the color of GoodNotes tabs. Recently, many devices have switched to OLED displays. OLED panels are particularly vulnerable to blue-toned colors, which can cause image retention or burn-in. While the current blue color scheme of GoodNotes is visually appealing, long-term use increases the risk of image retention.

3) Unified theme settings (Menu Tab background color + Document Tab color all change)
: Please add a theme option in Settings that allows users to change the menu tab colors, GoodNotes icon color, and tab colors all at once.

I believe these theme customization options would improve usability, reduce display fatigue, and better adapt GoodNotes to a wider range of modern devices.