Show different sidebar based on the current page - docusaurus

Question

Is it possible to show different sidebars depending on what section of the site you're in? So if I had two sections (Books and Countries) then I could show the corresponding sidebar menu object:
module.exports = {
books: {
"Children's Book": [
"books/childrens-books/winnie-the-pooh",
"books/childrens-books/harry-potter",
],
"Non-Fiction": [
"books/non-fiction/hitchikers-guide",
"books/non-fiction/a-history-of-england",
]
},
countries: {
"Europe": [
"countries/europe/england",
"countries/europe/france",
"countries/europe/spain",
],
"Asia": [
"countries/asia/china",
"countries/asia/india",
"countries/asia/laos",
],
},
}
The docs do reference that something like this could be done, but there aren't any examples to go along with it:
You can have multiple sidebars for different Markdown files by adding more top-level keys to the exported object.
The only other place I can find sidebars referenced is in docusaurus.config.js, but I'm not sure what this section is for:
presets: [
[
'#docusaurus/preset-classic',
{
docs: {
sidebarPath: require.resolve('./sidebars.js'),
},
...
Any pointers appreciated!

Answer 1

So the issue was that my content structure didn't match what I had in sidebar.js. This is my content structure now:
docs
├── README.md
├── books
│   ├── childrens-books
│   │   ├── harry-potter.md
│   │   └── winnie-the-pooh.md
│   └── non-fiction
│   ├── a-history-of-england.md
│   └── hitchikers-guide.md
└── countries
├── asia
│   ├── china.md
│   ├── india.md
│   └── laos.md
└── europe
├── england.md
├── france.md
└── spain.md
├── docs
├── docusaurus.config.js
├── sidebars.js
└── src
I think the issue lay in the fact that Docusaurus couldn't find the articles I was referencing, so it just didn't parse.
With this set up URLs like localhost:3000/docs/books/childrens-books/harry-potter will work fine, but localhost:3000/docs/books/childrens-books/ will return a blank page since there's no corresponding article for that URL.