Changing mobile view without it affecting Desktop

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i’m just trying fixing the mobile view of my site. But it keeps effecting my desktop view a lot. Just by enlarging a stack on mobile. Could someone please explain to me what’s happening?

https://www.loom.com/share/859d0b4bc75246dc9ff48b9f10568b12?sid=88c13b35-796c-4ddb-a82a-6c0298a4638b

Video to show you

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I would also like to know:

How do I keep my desktop design different from my mobile…

I began by executing my mobile design first, I like it - now I try and design my Desktop site and it keeps altering my mobile view - which I dont want…

Please tell me this is possible and how haha