When entering a matrix on double-click I then try to exit it by double clicking somewhere outside of voxels. Exiting works for smaller matrices. It does not work for bigger matrices (for instance 300x300x300). Clicking on the breadcrumbs navigation bar does work to get back to the model.
UPDATE: It works but the time threshold between registering of the first and the second clicks seems to be dependent on the overall Qubicle performance and the big matrix editing lag. The bigger the matrix, the less time I'm given for the double click to be registered.