Change the Seller Home page to Lightening Home page by default for Sales app

Hi,

I see Seller Home  as the default Home page for the Sales app. I tried to change to default home page by going Set up > Lightening app builder > Pages > New Home Page. I set the new Home Page as default. But I still see Seller Home page in my Sales app. 

I don't see the edit page option on the home page.

Please help me with these 2 issues

Thanks

Uma