Cannot optimize my site for mobile, any ideas?

Hey I am struggling to get my site to optimize for mobile. Does anyone have a lot of experience with wordpress that can explain to me why I have no options on the editor for device specific optimization? I am a bit confused if my editor is the classic editor or gutenberg? I also cannot stand the default editor. It's a pain

https://gyazo.com/e1816bc9a118975f67c53fd71a267d0f
https://gyazo.com/24b4f5544e8b4c41de3ef1d9cf7f2e9e

I am also confused because I cannot edit my pages unless I am editing the template attached to them.
https://gyazo.com/b72a67443acdbfd755a1b059027c8c9d
https://gyazo.com/450e3c6ca497e4cbd53a42142c639391

Any help would be incredibly appreciated. My website does not function properly on mobile.