Not quite sure what you're talking about with "open up the option beyond press/show document content". But, if you are just trying to extract text from a print layout and save as html, here's a suggestion.
1) Create new web layout
2) Go to print layout and click on text block with content tool
3) in Edit pull down menu, "Select All"
4) Paste in most basic text block possible in new web layout
5) Export new web layout to html (File > Export > HTML )
voila.