The option to Open in Webflow is set per project, and has nothing to do with the Popular category. It can be turned on or off by the designer who showcases his project. hence you can find projects to open in Webflow, and some without the option.
so friend it was like that. I have here more options to see this and in fact the button only appears for design that are clonable I opened the reverse of the projects that I used to learn and everyone does not have that option anymore