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Currently it is not possible to 'Open Type' classes that are currently closed in the 'Project' tab. However in a maven project it is custom to have many submodules and there it would make sense to haven an option for 'Open Type' that would search classes also in closed 'submodules'. Thus 'Open Type' could first look in all open projects for fast access and then continue to look in the closed/submodules. I tend to get frustrated with 'Open Type' since I try to use it first, then it wouldn't find my class and then I use 'Open Resource', therefore I try more and more to completely neglect 'Open Type' since it is just not returning enough classes.