As a dedicated user of GoodNotes, I have been exploring the app's features and functionality, and I believe there is an opportunity to improve the app's highlighter and pen thickness options. Currently, the available thickness sizes are limited, and it can be challenging to find the ideal thickness size for specific note-taking situations. This can have a significant impact on the user experience, making it difficult to achieve the desired level of precision and accuracy.

Therefore, I suggest that GoodNotes consider expanding the range of available thickness sizes for both highlighters and pens. Alternatively, it would be helpful to have the option to manually enter and select a custom thickness size. This would provide users with greater control and flexibility over their note-taking experience, resulting in increased productivity and efficiency.

In addition, it would be great to have an option to control and change the slider increment size for pen thickness settings. Currently, the increment size is set at 0.05mm, which may not be ideal for all users. Allowing users to customize the slider increment size would enable them to fine-tune the pen thickness settings to suit their individual preferences and needs.

By implementing these suggestions, GoodNotes could enhance the user experience, making the app even more versatile and user-friendly.