Edit Theme Button On My Project Page Doesn't Show Up, Does It Need Some Things? 

* Sorry For My Bad English.

It needs a wide enough browser window. If you're on mobile, for example, it probably won't be visible.

If on a mobile device on chrome > enable request desktop site > set screen to auto rotate > hold mobile in landscape. Done.

Hey, I got a trick to show the theme editor on small screen devices. All you have to do is just run a line of javascript, from the url bar. Type

javascript: (()=> {document.querySelector(".edit_theme_btn").click();})()

DON’T just paste it in the url bar, because the browser might remove the “javascript:” part from it. You can add that again though.

If you want to use it frequently, make a bookmark of that code, and use that.