The thumbnails for items in galleries in Enterprise Sites stretch to fill the available space. If there are four items on a line, it looks fine. Three looks ok, but is grainy. Two or one items looks terrible, because they are stretched over too much space. This looks extremely awkward and appears to be a bug. The example below is truncated because it's a private site, but it shows the phenomenon. This white card should only be about 25% of the space.