My structure is correct. Bug is somewhere else. I used that code to hide content for logged/non logged user 
<t t-if="website.user_id == user_id"> CONTENT </t>

<t t-if="website.user_id != user_id"> CONTENT </t>

Hiding works fine, but with that element visual builder is not working properly. Can someone help me fix that? 

Every web page has its own QWeb view. This is an example for a homepage:

<t name="Home" priority="29" t-name="website.homepage">
  <t t-call="website.layout">
    <t t-set="pageName" t-value="'homepage'"/>
    <div id="wrap" class="oe_structure oe_empty">
      <section class="s_media_block" src="https://youtu.be/J1xzhXmta04" loop="loop" autoplay="autoplay" opacity="1" background="js-rgba(0, 0, 0, 0)" iframefit="fitCont" style="height: 544px; overflow: hidden;">
        <div class="v-align text-center preserve3d">
          <h1 class="text-center">Any Text<br/></h1>
        </div>
      </section>
    </div>
  </t>
</t>

This may help you understand the structure of Odoo web pages.