We are happy to announce that we shipped another version of Skype for Business on Mac. You can find all changes in our release notes and I copied them below for your convinience:
Users who are Presenters in a meeting can now end the meeting from Skype for Business on Mac by selecting More Options (...) and then End Meeting. When a meeting is ended, all users in the meeting are disconnected.

Note: Skype for Business Online users only.
Display Join Meeting Audio dialog box for every meeting
Users will now see the Join Meeting Audio dialog box when joining a meeting from the Meetings tab in addition to when they join a meeting from outside of Skype for Business on Mac.
Help for adding delegates
A new help link in the Calls page of Preferences dialog box will make it easier for users to access documentation describing how to add delegates in Skype for Business.

Improvements
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Fixed an issue where the app doesn't automatically select a connected audio headset when making a call or joining a meeting.
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Fixed an issue where incorrect dial-in phone numbers for some regions were displayed for online meetings in Outlook. This requires Outlook for Mac 15.37.170815 or later.
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Fixed an issue where the Take over as Presenter button is not disabled when the user is demoted from Presenter to Attendee in a meeting.
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Fixed an issue where users see an incorrect error message when a presenter ends a meeting.
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Fixed an issue where users might see a black or gray screen when someone shares a screen in a meeting.
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