Issue
Since Eclipse Mars? there has been always a context menu on projects, to add the current selection to a working set. This option seems to have disappeared in Eclipse Oxygen.
How can I add one or more selected projects to a working set?
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This is how I access the working sets:
Solution
It seems like this is now called "Assign Working Sets..." and is found in the same group as "Refresh" and "Close" in the projects' context menu.
Alternatively, you can just drag & drop the selected projects into the desired working set, provided that you are showing working sets as "Top Level Elements".
(Assuming this is about the "Package Explorer" view; the "Project Navigator" seems not to have that feature, but here you can still use drag & drop.)
Answered By - tobias_k
Answer Checked By - Robin (JavaFixing Admin)