For years I found it hard to remember or get used to how Dopus was laid out. Now it all makes sense and why they did it the way they did.
I find the easiest (and most universal) way to get to Folder Options (Leo's screenshot from your other thread and what JohnZeman said) is to Right-click a column Header (Name, Size, Date etc) -> More... -> Display tab -> Auto-size columns. Then make sure to Save this format to this folder or all folders using the "Save" drop-down menu on the top right of this same Folder Format window.
Don't forget, you can do a configuration backup before formatting or reinstalling. That why, all the little things you set will be restored.