XnView Software

Hello, i have a big folder structure with a lot of subfolders. I wanna generate nice folder kathalog thumbnails.
Is there a way for the katalog to only scan for the folder thumbnails (only folder and subfolder structure) and not for all the filesthumbs in each folder, cause this would take way too long.
I cannot find this option to klick.

thanks CH

Perhaps a part of solution:
If your folders looks like :
D:\Photos\2019\
D:\Photos\2020\
D:\Photos\2021\

Display another folder than D:\photos in the browser.
Go to Settings, Catalog
Delete only the line "D:\Photos" in the table
Display now the D:\Photos folder in the browser, so that only the thumbnails of the subfolders shown in D:\Photos will be renewed.

Repeat the method for the folders that do not contain any photos, but require folder thumbnail renewal ?

thanks!!