When navigating individual Suttas, looking over the parallels is something that is common to do. However, when you click the “parallels” button, the parallels are hidden by being collapsed. You need to uncollapse them every time, and it adds an extra step.
Since parallels are the last section in the list, it wouldn’t change anything to have them uncollapsed (even if the list of parallels is long, nothing comes after, so it doesn’t change anything). Could parallels for individual Suttas be uncollapsed by default?