Table Enhancer for GitHub is a small, unofficial Chrome extension that makes wide tables easier to read and review in GitHub Markdown file previews.
Install from the Chrome Web Store Read the user guide

The extension runs only on GitHub Markdown blob file preview pages, such as:
https://github.com/owner/repository/blob/main/docs/example.md
It does not run on issues, pull requests, discussions, repository home pages, or Markdown rendered outside GitHub blob file views.
Table Enhancer for GitHub does not collect, transmit, sell, or share user data. Freeze defaults are saved locally in your browser with Chrome storage.