How to set the word from scarlet letter to black on Xiaomi mobile phone tablet?

find the input method settings, handwriting settings and track color modification.

Xiaomi blackboard is a simple handwriting board, which can be used as an auxiliary tool for children to learn to write, and can also be used as a small drawing board for graffiti. At the same time, it can also be a helper to improve office efficiency, draw sketches, write essays, record inspiration moments, make brainstorming more efficient, and draw pictures to help expand thinking.