2. Find the "I" button in the open interface and click Open.

3. Click the "Settings" button in the open interface, and then click Open.

4. Find common words in the open interface and click Open.

5. Find the word "font size" in the open interface and click Open.

6. Select your favorite chat font from the slider at the bottom of the opened interface to modify it.

7. After selection, click the "Finish" button in the upper right corner.