Latest releases are an advanced feature, not generally available.
Latest ReleaseAn latest release is when you want to show the current standings of the leaderboard for the current weekly competition. For example, in a weekly competition that ends on Friday, a latest release on Wednesday would take into account all the scores from the previous Saturday up to the Wednesday to show the current standings. So allowing players a couple more days to improve on their rank.
Latest Release (saved)Normally latest releases are overwritten by the next release, you can keep a latest release by making it a 'latest release (saved)' so a permanent record may be kept of the scores at that point in time.