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Use case: 1) Create Java Application project (File->New Project->Java->Java Application) 2) Create NetBeans Module project (File->New Project->NetBeans->Module) 3) Select both projects in Project tab and right click on anyone 4) I see no Close Projects action available in the popup menu The same for Java Application and Web Application projects, Web App and Maven Project, Maven Project and NetBeans Module project, etc. Works fine for e.g. NetBeans Module and Web Application projects.
Workaround is to do that via File->Close N Projects.
*** This bug has been marked as a duplicate of bug 183564 ***