Hi JefDC,
Welcome to the Microsoft Community. I am a Microsoft user just like you, and I hope you are well.
Please note: This is a user-to-user community forum. We are users just like you who help others. We are not employees of Microsoft.
To change the font to accept Thai input in OneNote on an Android phone, follow these steps:
a. Add Thai language support to your device:
b. Go to "Settings" and search for "Language".
c. Select "Add a language to this device".
d. Choose "Thai" and click "OK
Clear the data of the OneNote app:
Go to your device's "Settings".
Select "Apps" or "Applications".
Find and tap on "OneNote".
Tap on "Storage" or "Storage & cache".
Click on "Clear data" or "Clear storage" and confirm the action.
Reopen the OneNote app:
After clearing the data, open the OneNote app.
The first time you run the app, it should display the correct Thai font for input
I hope this information is helpful. Please let me know if you have any other questions.
Best Regards,
Umar Majeed