This members-only tutorial provides the steps to use Post Password Protected condition for outputting multiple sections/elements on a Page only after the visitor enters the correct password.
To password protect a Page, in the Page edit screen use the Post Visibility setting in the Status & Visibility meta box.
Don't forget to Update the Page.
Step 3
Edit your Page with Oxygen.
Let's add a Section that has the form for visitors to enter the password to unlock the hidden (not technically hidden via CSS, but we should say not output in the HTML) elements.
Background Color: rgba(221,221,221,0.3)
Add a Code Block inside the Section having this PHP & HTML: