DO I have to go with a blank site to see them?
Sorry the Add section is blue I was highlighting it with yellow which made it green. When you press the add section button it should show something like the below with a list of preset categories with design options. The top one (preselected) are different preset Flex options. Clicking on any of these will load that layout. If you aren't seeing something like the below when you press the 'Add section' button then it would be best to contact Duda support because there's something else going on that's not normal.
If you add a section by hover on the +section button between rows
you can then add preset flex (or other) rows.
adding a new section or row via the row section will always be blank.
I click in the middle to add section while hovering and the FLex sections still appear blank. what am I doing wrong?
The add section appears to me blue, not green