Working with Block visibility

Blocks are boxes of content rendered into an area, or region, of a web page (such as "User Login" or "Who's online") that can be displayed in regions (such as footer or sidebar) on your page. This functionality is provided by the Block module, which is a part of Drupal 8 core. 

Template Whisperer expose a conditional visibility called Template Whisperer.

This condition allow individual blocks to be configured to only show/hide on certain pages based on the suggestion attached to. 

How to setup the Template Whisperer Block Conditional Visibility

• Open the Block Admin page Administer > Structure > Block Layout.

• Click Configure.  You will see a new "Template Whisperer" visibility section.

• Hitting Save block button will place update the block & save the conditional visibility.