The top two fields determine color and hover color for your crumbs, and font size to set the size of your crumbs. 

Use position from top and margin settings to position the crumbs on the page. 

(background and opacity can be used when styling breadcrumbs on top of a patterned window background.)

Include Site Landing Page

Check this to include your site landing page as your first breadcrumb. (If unchecked, the first breadcrumb that links to the site landing page will be suppressed.)

Max Crumbs Before Collapse

Use this setting to control the number limit of breadcrumbs that will be displayed on page load before collapsing (with ellipsis … ) occurs.

See Master Page Layout > Page Designer for more information on toggling off breadcrumbs at the Master Page level.