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<?php

namespace Smartwave\Megamenu\Plugin;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Store\Model\ScopeInterface;

class RemoveBlock implements ObserverInterface
{
  protected $_scopeConfig;

  public function __construct
  (
      ScopeConfigInterface $scopeConfig
  )
  {
      $this->_scopeConfig = $scopeConfig;
  }

  public function execute(Observer $observer)
  {
    /** @var \Magento\Framework\View\Layout $layout */
    $layout = $observer->getLayout();
    $block = $layout->getBlock('catalog.topnav');  // here block reference name to remove
    if ($block) {
      $remove = $this->_scopeConfig->getValue('sw_megamenu/general/enable', ScopeInterface::SCOPE_STORE);
      if ($remove) {
        $layout->unsetElement('catalog.topnav');
      }
    }
  }
}