The toolbar and notebook name does not show when I call and load the themes from the notebook.
I can load the themes from notebook using a code but I am not sure how to
I just installed the jupyter themes and went thru the same issue. My regular and nbextension toolbar disappeared and could not make it come back unless I reverted to default !jt -r
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after some research i fugure it out....so your cell should write
from jupyterthemes import get_themes
import jupyterthemes as jt
from jupyterthemes.stylefx import set_nb_theme
set_nb_theme('solarizedd', -T, -N,-kl)
see the documentation documentation of jupyter theme
or something more permanent and fewer lines of code, using the command "!" in the actual cell
!jt -t solarizedd -T -N -kl