I don’t see the export button in my postman app v10.15.1.
How I found the problem:
While trying to export a postman collection with GraphQL requests.
I’ve already tried:
Asked chatgpt 
And searched in the community and www.
Sorry we didn’t get to this sooner. This isn’t the experience we want for our users.
We’re closing this post as part of a community cleanup effort. We do have an open issue for this, over on our GitHub Issue Tracker.