This last step is quite simple. We can navigate to the Block layout page by directly entering the URL of /admin/structure/block or by using the Admin toolbar and clicking on Structure and then Block layout.
Deleting a block from the Block layout page does not actually delete the block completely, it only removes the block from displaying within a region. To delete the Search form block, Powered by Drupal 8, and our custom block, we need to click on the drop-down button next to each block and choose the Delete link.
We will be prompted to confirm the deletion. Click on the Delete button to complete the process.