Picture gallery, is there any way to only point it to a folder, and make it STOP digging in to sub-folders?

How to I display pictures in the picture frame only from a certain folder, and not it's sub-folders?

The problem here is that I point the 'random picture frame' feature to display the pics from my Picture folder. That part is OK, but the problem occurs when the 'random picture frame' thing digs for pictures in the sub-folders. I don't want that. There are some questionable pics in there that should not be displayed on a living room computer.

I am not about to completely re-arrange my entire picture collection to another folder. I would be wasting unnecessary file space, so that BumpTop could be pointed to that folder, because I have thousands of vacation photos.

So, is there any way to only point it to a folder, and make it STOP digging in to sub-folders?