I would like to express my appreciation and gratitude for the GoodNotes application that you have developed. It has been tremendously helpful in my daily studies and work, providing an excellent and convenient platform for recording and organizing my thoughts.

While I am satisfied with many features of GoodNotes, there is a particular function that I believe could further enhance the application if incorporated. This is the ability to adjust the format of handwriting. I've noticed that we can already modify the color of our strokes, which is a very practical feature. However, if we could also adjust the thickness of our strokes, such as choosing a thicker pen to highlight important points, or a thinner pen for smaller text or annotations, it would significantly elevate the user experience.

This function would allow us to personalize our notes even better and give us more freedom in crafting them. I believe it would make GoodNotes more powerful and practical, potentially attracting more users to the application.

I look forward to your response and appreciate your efforts to continuously improve the application to meet user demands.