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From the context menu of a project node it should be possible to close all other projects. Within the 'File/Open project' dialog there should be an 'close unrequired projects' beneath the already existing option 'open required projects' The defaults for both options should be configurable. To be consistent, an option 'close current projects' should also be available in the 'new project' wizard.
Possible. Jano, any interest?
Best done differently, e.g. issue #50683, or issue #57432. *** This issue has been marked as a duplicate of 50683 ***