Unable to scroll or view entire thread on Apple Community forum

Without knowing which exact thread you wish to view (and even so it would take me time to search for it) I just provided the entire current listing of all iMac topics. That is the forum view. Click on a "question" to show all the replies to that question. If you are looking for a particular thread then you'll need to let me know what it is (if it is one in which you participated then it will show in your subscriptions under your avatar at the top right).

Clicking on a question should display all the posts and if there's a lot of them then your browser should let you scroll. If there are many of them you may have to go to the next page using the numbers at the very bottom of the reply list.

I don't use Windows. I have used multiple Mac browsers with the forum and I haven't had any issues where it wouldn't show me the list of posts when I actually went to a thread from the forum thread list.

Are you looking for this? --> 2011 OS Lion.. Can't Install Windows 8.1 … - Apple Community

How are you entering the forum? Some are secondary levels off a main level. For example, the iTunes forum has different sub-forums. If you enter the top level page you will only see a list of a few of the threads in each sub forum. Click on a sub-forum and you will see the entire list.

You don't say what equipment you are using. I know with my iPhone that one app I use a lot has a tiny scroll bar on the far right. The old drag scroll method no longer works on that app unless you have your finger against the extreme edge. I only visit this web site on a computer though.

How about this link? iMac - Apple Community

I still don't know what hardware you are using. I pretty much only ever look at this support site with my computer web browser.