When using the project view, there is no way to know what portfolios the project has been added to. We should see a list of related portfolios in a prominent location - top toolbar / menu, for example.
Hi @peter10 and thank you for taking time to share your feedback with us! I also believe it’s a great idea!
I have added my vote to it, don’t forget to add yours by clicking on the “Vote” button at the top left corner of this thread 
We are using heavily the feature of including same project in different portfolios. But the challenge is how can I understand in which specific portfolios my project(s) is(are) included?
Hi @Volodymyr_Chornyy, thanks for your feedback! As it stands, it’s currently not possible to see on which Portfolio a project has been added. We already have a thread on this topic so I’ve gone ahead and merged your post. with Ability to view related portfolios from a project view to centralize feedback. I’ll make sure to share any updates as soon as I have them!
Hi folks, closing out this thread since this option is available via the project info section ('i" next to your project title).