I have an album with 50 Sub-Albums and each of the 50 have 10 Sub-Albums. These 50 all have the Default Thumbnail option set to Random. Is there any way that I can do a bulk edit/change to set the 50 and their subalbums to Most Recent rather than Random?
Use the second button of the utility to set the default. But note, Unless you select a specific image as the album thumb it is unlikely to change the performance. Each of the other options require fetching all the album images.