It's annoying for sure, but at least you can resize the window.
Side note: Dan Luu claims[0][1] that there's no readability advantage to narrow line width. I haven't really looked into it, but in my experience it feels like he's very wrong.
[0]: https://danluu.com/slow-device/ [Appendix: this site vs. sites that don't work on slow devices or slow connections]