PC version. Sign In, Click on Routes, Select My Routes, this opens the routes tab. Click on My Routes - causes all your routes to be listed A-Z. Scroll down to Unnamed Route. Bottom right by sketch map se e Edit Delete. Click Delete. Window pops up to say route has been deleted. Click OK
This is how I deleted your routes from yesterday.
If you want to keep the route, click edit instead, click save option, rename route in edit window.
Phone version - open app - tap menu- under My Routes and Maps tap Routes - scroll down to route - tap options - tap delete