After I’ve searched several hours for a solution, I just found this workaround.
Open your bootstrap.css and replace
.hidden {
display: none! important;
visibility: hidden! important;
}
with
:not(#wpbody) {
.hidden {
display: none! important;
visibility: hidden! important;
}
}
This prevents the .hidden class is used in the WordPress Menu.
Is not beautiful, but so you can at least regain access to the WP options.
I hope WP will insert the solution from above.
