This should not be this difficult. I have a top-level notebook, let's call it Notebook1. I want to nest a notebook underneath it (let's call it SubNotebook1) like I've done multiple times in the past; however, now when I try it I end up with a new notebook called 'Notebook Stack' with both Notebook1 and SubNotebook1 nested underneath. This is a completely useless feature that should be burned with fire. I attempted to right-click SubNotebook1 and select 'Add to stack', but the notebook I want to nest it under does not populate in the resulting window and there is apparently no option to se