What only matters is when you made changes to that folder. it doesn’t matter when the album was actually created. That is, the latest added album will be situated at the top. On the other hand, here are the steps to create a collage with Google Photos. On tapping it, you will now have three options to sort your albums as mentioned below. When you visit the Albums section, there is a now a Most recent photo option.
Now, you have the option of changing this order.
That is, the newest created album always stood at the top. By default, the albums created in the Google Photos were always arranged based on last added, similar to YouTube’s sorting of videos of the Subscribed Channels.