For the description field, there should be two lines in the lower right hand corner of the description field that are angled. You can click and drag on that icon and it allows you to expand out the field to view more of it. This also happens in some of the system settings like escalation rules.
As for the notes section you can click on "All Notes" and it will show you all the notes on the record not just a condensed view, and then hover over the eyeball icon to see the full note. In my set up we do not use the activities section so I can not speak to that but based on how it looks, it appears that the same process would apply as it does with the notes section.
As far as I have been able to test I have not been able to revert this view, however perhaps someone from SysAid will respond with an update.