While using Visual Studio Code, I noticed that a yellow box appears when typing in Korean.

Although I initially ignored it, it became too distracting, so I decided to resolve it.

It also affected readability.

Cause of the Issue

The default settings in VSCode highlight all characters outside of the basic ASCII range.

The basic ASCII range includes printable characters from U+0020 to U+007E.

Since Korean characters fall outside of this range as Unicode characters, VSCode highlights them with a yellow box.

Although this feature is helpful for debugging or security purposes,

it is inconvenient for those who frequently use Korean, so I sought a solution.

Solution

1. Open Settings in VSCode by pressing Ctrl + ,

2. Search for Unicode Highlight: Non Basic ASCII in the search bar.

Unicode Highlight: Non Basic ASCII

Controls whether all non-basic ASCII characters are highlighted.
Only characters between U+0020 and U+007E, tab, line-feed and carriage-return are considered basic ASCII.

3. Change this option to False and save the setting.

4. Return to your code to check if the issue is resolved.