You can sort the list of albums by:
Most recent photo in the album
You can change this order by editing dates. To Edit the "Date taken" of a photo at Google Photos:
Open a photo, click the "i" (Info) icon and click the pencil (edit) icon to the right of the date
To "batch edit" date and time: select multiple photos, click 3 dots ("More options"), then "Edit date & time".
Click either option "Shift dates & times" or "Set one date & time" and make your changes.
Album title
Last modified (on top)
To change to another way of sorting: on https://photos.google.com/albums or Library > Albums on mobile devices, tap on the actual sort mode shown at the right side and select the desired sort mode.