Group Series Episode

[TheDreadPirate]

Scroll down to the section displaying the following episodes of that same season, titles "More from Season X". In that list, long-left click on the first episode you want to group for about 3 seconds. This will select the episode, after that use a normal left click to select the 2nd episode you want the first episode to group with. After you have selected all episodes to group, use the hamburger menu (the 3 dots) to the upper right corner of the website and use the "Group Versions" menu item.

You're not going to like this answer.  In this part of the guide when you are selecting the episodes you want to group together the order you check the boxes in is the order in which they will appear in the dropdown.

Yes, it's stupid.