I wonder if there's a way to know how many positions are inside a repertoire or folder.

The only way I know is to go to statistics / Complexity, then uncheck "value as a percentage'. You will see the number of positions for each opening/variation. I don't know of a way to get a summary number.

Thanks, it's exactly what I needed.
Better again, if you delete positions you see the real number of positions and not the total.