On https://doc-snapshots.qt.io/qtcreator-14.0/, when I expand the left side bar fully, and then scroll down and click on e.g. Reference / Technical support, the requested item opens properly, but the sidebar gets re-set to the top, so  to read the next Reference topic I have to scroll down, visually find the "Technical Support" topic and then target the one below ("Version Control System"), click there, again getting the appropriate page, but with the side bar scrolling back to the very top.

The problem is present also for Qt docs, but less prominent there as the fully expanded sidebar and consequently the distance to scroll is shorter.