Hey Annett,
The first screenshot that you shared is from EasySocial's Leaderboard.
May I know where did you see the leaderboard link?
If it is coming from the toolbar
https://take.ms/MsKCU, you can disable the
Enable Points setting from the General setting.
If you want the Point feature but want to get rid of the leaderboard link only, you can copy the
default.php file from
JoomlaFolder/components/com_easysocial/themes/wireframe/toolbar/default.php and paste it at template override location which is at
JoomlaFolder/templates/yourCurrentTemplate/html/com_easysocial/toolbar/default.php.
Take note that you need to create the folders manually if you don't see it.
After that, you can look for and remove the following PHP code in the
default.php which is from the template override location
https://take.ms/AOeTl :
<li>
<a href="<?php echo ESR::leaderboard();?>"><?php echo JText::_('COM_EASYSOCIAL_TOOLBAR_LEADERBOARD');?></a>
</li>
Can you have a try and see how it goes?