Knowing why the scroll bar disappears on certain web pages may help you prevent future frustration. There are three reasons why a scroll bar may disappear on a web page. It is relatively easy to make the scroll bar reappear.
If your computer is infected, your scroll bar may have been disabled on certain web pages. Run an antivirus or antimalware program to clear the virus.
If you have not cleared your caches recently, an error might occur causing the scroll bar not to load. Try clearing your caches and refreshing the web page.
If the web page is short and has less than one page of text, a scroll bar will not appear. Hold down "Ctrl" and press "+" repeatedly until the scroll bar appears.