Removing secondary sidebar still takes up width #903
Description
Describe the bug
From the documentation there are two ways to remove the secondary sidebar from a page: via page-wide metadata :html_theme.sidebar_secondary.remove: or via html_theme_options in conf.py and set the "secondary_sidebar_items" for a particular page into an empty list.
pydata_sphinx_theme works correctly.
In sphinx_book_theme the secondary sidebar actually still exists and takes up width, though empty.
It is like the fixed pydata_sphinx_theme issue pydata/pydata-sphinx-theme#1686
Reproduce the bug
remove the secondary sidebar from a page: via page-wide metadata :html_theme.sidebar_secondary.remove: or via html_theme_options in conf.py and set the "secondary_sidebar_items"
List your environment
No response