Hi. I found this is the help at https://www.gpsoft.com.au/help/opus12/index.html#!Documents/Calculating_Folder_Sizes.htm but I finsd the manual almoast impenatrabel.
" You can also control automatic calculation on a per-folder basis using the [Folder Formats]system - the Get folder sizes switch on the Options tab of the Folder Options dialog lets you turn counting on or off for any folder."
I have managed to get to Folder Options (by reading a further 2 manual pages) But can find Folder Options.
Dont get me wrong, DO is excelent, its just I find the manual needs work.
Ben