Focus on Content in SharePoint is a small icon on the SharePoint page, and once you click on it, you can see that Quick Launch bar and Top link bar disappears. As it name suggest it focus on the content and remove all the links. In case you want to remove that icon. you can place the below scripts in Script Editor Web part.
<script language=”javascript”>
_spBodyOnLoadFunctionNames.push(“Hidesuite”);
function Hidesuite()
{
document.getElementById(‘ctl00_fullscreenmodeBtn‘).style.visibility = ‘hidden’;
}
</script>
Steps
1.Edit the Home page.
2. Insert Script Editor Web part
3. Place the scripts.
4. Check in and Publish the page.