Hi, Nikolay.
I'm Jen. I'm an independent advisor and would happily help you figure this out.
I understand you prefer removing the scroll bar. Unfortunately, I can't seem to find an option to remove it and in this case, it would be best to submit feedback to Microsoft Edge. You can press Alt+Shift+I or click on Settings then go to Help and feedback and select Send feedback.
Feel free to share how it went.
Kind regards.