I try to edit my pdf today using livecycle designer, but when I open the file, I can only select up to the form page - cannot access all the objects under the form (at the heirarchy pane and the design view).
Sorry, my silly mistake. I had locked all fields in the form so I will not mistakenly move them. Press Ctrl+A at the designer automatically select all objects in the forms, and then I click Edit/Lock/Lock Fields.