Your issue when turning on dev simulator is that it is defaulting to "iPhone 14 pro Max". This can be seen on the top of the chrome dev tools picture you sent. You can set this to anything.

The new view of the drop down menu is the default iPhone view. All iPhone will force their style of dropdown menus, among other things as well.

Recommendation: Just use Something like rem or dvw in you CSS for font size, this will change based off of the aspect ration or width of the screen. You could also have a @media query in your CSS.

Hope this helped!

I see you're building something with crypto: Do not scam people & Stay safe.