Sorry guys: I screen recorded the window instead of the entire screen both times.
BUT I found out that when you close the entire window, the function of opening a new tab with Command + T and the cursor going to the correct place works again!
So, the first error is: when you customize the toolbar, you need to close the entire window so the function works correctly.
I also showed on this video the second error: the close button doesn't work; you need to close the Orion browser on the docker instead.