Can't see video folder since upgrade

I have just upgraded to V1.5.1. Prior to the upgrade, I had all my TV programs and films in C:\Video, in folders, so that a series might be kept in C:\videos\series\breakingbad, and this could be seen on the TV. Serviio -> Linked Device -> Series -> Breaking Bad

Since the upgrade, all of the folders have disappeared, and on the TV, I can only see folders with the first character of each item - and the file titles have no relation to the series or films.

I suspect that I may have to set something in Serviio Console, but can't see what - any suggestions, please?

I have managed to figure it out, and I post the answer here in case anyone else has the same question.

On the Presentation tab,
set Video to Display Category
set Video -> Folders to Display Content Only
and set all other Video -> (other settings) to Disable.

Not sure of the logic behind these settings, but they work for me.