First of all I want to thank @yaniv14 for the time spent on my test shop!
I just made clean install of thirty bees 1.0.3 without demo products. Changed the view of the back end theme and added a directory called new1. After that on the main category menu I am able to see Home category (which I don't usually see) and when I try to add another category and make it sub, I can't expand the tree.
Those are all the steps I did, so if anyone has any suggestions is welcome! I can't believe I am the only one experiencing that issue, it is at least 4 clean instalations with or without demo products and same behavior every time. If anyone believes can help with solving the issue please write me message to give you access to the server and backoffice!
Here are pictures with the home category listed and the "expanded" category tree.