Removing "Showing post with label...show all posts"

Step 1.

If you are using the old Blogger interface:

• Go to Dashboard - Design - Edit HTML - Expand Widget Template (make a backup)

If you are using the new Blogger interface:

• Go to Dashboard - Template - Edit HTML - Proceed - Expand Widget Template (make a backup)

Step 2. Now find (CTRL+F) this code in the template:

<b:includable id='status-message'>
  <b:if cond='data:navMessage'>
  <div class='status-msg-wrap'>
    <div class='status-msg-body'>
      <data:navMessage/>
    </div>
    <div class='status-msg-border'>
      <div class='status-msg-bg'>
        <div class='status-msg-hidden'><data:navMessage/></div>
      </div>
    </div>
  </div>
  <div style='clear: both;'/>
  </b:if>
</b:includable>

Step 3. Delete the code from above and replace it with this one:

<b:includable id='status-message'>
<b:if cond='data:navMessage'>
<div>
</div>
<div style='clear: both;'/>
</b:if>
</b:includable>

Save Template Now You Are Done