Hi Waclav,

it depends on used template. In modern one (Helix Ultimate) you can disable from Templat Options > Blog > Details > Social icons

In older ones, based on Helix3 - you may need small php code customization, easy one.

templates\shaper_NAME\html\layouts\joomla\content\social_share\share.php

delete whole link block inside <div class="google-plus"> ..... </div>

or custom CSS method

.google-plus {display: none; visibility: hidden; opacity: 0;}