How to change theme in jupyter notebook without losing toolbar menu?

Question

Python

Hello!
I'm using Jupyter notebook, but I haven't fully figured out the settings. Tell me how to make the following changes in the settings:
1) What dark theme should be installed so that the toolbar menu does not disappear?
Themes from here https://github.com/dunovank/jupyter-themes result in menu loss.
2) How can I add the caption "Out" to the cells? Default is "In"
Thank you

Answer 1

1) Use -Tthe argument on the command line, it is also written in the readme

# toggle toolbar ON and notebook name ON
jt -t grade3 -T -N

2) It is necessary that the cell contains some kind of expression, for example range(9), or

r = range(9)
r