I am trying to export collections from Postman desktop, and I see many tutorials about exporting it from the sidebar which has a dropdown with export or from the collections page, but I have latest version of the Postman desktop and I neither of those options. I have looked into this Q&A: Exporting Collections - #6 by dhavaldesai_11, but this has not been helpful.
Should be as you described;
If not, could you provide a screenshot of what you see?