Select 'Webform from URL' to display this block, when the current request's path contains the selected webform.
Select 'Webform submission from URL' to display this block, when the current request's path contains a webform submission that was created from the selected webform.
Select 'Node from URL' to display this block, when the current request's path contains a node that references the selected webform using a dedicated webform field or node.