How Can I Delete Email On My Smartphone Without Deleting Them On My Desktop

I think when I delete on my phone and it deletes on my desktop.

I went to advanced, checked to have deleted messages on my phone but it doesn’t save the change. I want to keep my phone clear of clutter. I can’t access all the information from an email on my phone like I can on my desktop. Or I may want to go home and send my email response from my desktop, not from my phone.

How can I stop my emails from deleting from my desktop?