Hey @Fatiiza , 

a people picker has a lot of information about a person in a dataset, so that's why we used a collection to save the data.

If you want a specific value from the people picker e.g a mail address, you can simply use the loop for each action in the workflow and add the E-Mail to a new collection.

Attach you will find a small WF as a screenshot which explain the function.

Hi Sven - I had the same issue as the OP and was able to use your solution to resolve - thank you. My case was slightly different though - I only had one user in a people field (which was set to “Allow multiple selections = No”) - so even though I understand why a collection is used for all the properties of a user, I’m confused why those properties aren’t active for a single user. Is there a case where it is possible to use the people collection property variables for a single user? Thanks!