Is there any library to see the user-id and the details regarding the element which is added to endevor?
Go in to Endevor, Master display panel and you can see USER ID and what action they done, when they done etc...all the details.
Coming to your second question, to check details of USER id, it's completely independent to Site installations.
In best case, if you have access use TSO ACF command and give L (Space) USER ID, it will give complete details of user id if your id have enough access, else...there should be user id dataset which Endevor rules will cross check. if you know that you can always look in t it.