What I’m trying to do:
I am trying to set a column panel to full width. The form is a blank form not inside the content_panel of the Standard Form. See snip below - green box is a FlowPanel - red is the ColumnPanel. Flow panel full width is working as expected - column panel shows the bounding box exgtend to full width but the content is still constrained. The top panel is also a column panel.
For anyone that needs this in time to come, see attached clone link showing two full width column panels, one with a button set to full width row at the top and the bottom one with the panel set to full width but the buttons without full width.