The menu layout of Scanner App is off. Please use the following direction to install Japanese font and fix the layout.
How to fix the layout
The tablet PC needs to be connected to the internet.
1. Select [Settings] from start menu
2. Select [System]
3. Select [Apps & features]
4. Select [Manage optional features]
5. Select [See optional feature history]
6. Select [Japanese Supplemental Fonts] and [Install]
7. The font will be installed within few seconds. Reboot the tablet and check the Scanner App's layout is fixed.
*Without rebooting the tablet and run Scanner App, the font will not be displayed.