sorry I can't understand what problem you've encountered, can you show a screenshot of your file structure?

(pages)
(slug)
[..slug]
page.tsx

in the (pages)
i have
another folder of category
(category)
page.tsx
layout.tsx


in the slug page.sx i am rendering components dynamically depends on the route

code example:

if (category && subCategory && articleID) {
return <Article articleID={articleID} />;
} else if (category && subCategory) {
return <SubCategory />;
} else if (category && articleID) {
return <Article articleID={articleID} />;
} else if (category) {
return <Category />;
} else {
return notFound();
}

I want to have unique layout for my category but somehow the layout.tsx working only in the slug folder and not in the category folder

here's a problem, isn't (category)/page.tsx and (home)/page.tsx share the same route?
Route groups won't affect the actual URL of a page, which means they are conflicted together

I guess you're trying to do: /[category]/[sub_category]/[article], where every dynamic route has its own unique layout.

For the layouts, you can split it into multiple folders like: /[category]/(category)/layout.tsx and /[category]/[sub_category]/(sub_category)/layout.tsx

route groups should be used under the dynamic segment

now layout works in category, but the validation i am making in my slug that is category valid not working now because the [category] is dynamic route, should i move my category validation to the [category] page.tsx? or my approach from the begging wasn't right that i am using slug, i made this approach because i don't want to add a lot of folders of [category][subcategory][article-id], [category][article-id] and every page expect of article have the same layout, is my approach and code hierarchy is right?

people usually do that because they're using a remote CMS like Sanity, if you don't need that, just create a folder directly.
But why do you need validation? just invoke notFound() if such a page doesn't exist, or use a middleware to do so

i am using cms, the validation is just array of categories names that i check if the category name is exist in the array if not i am invoking the notFound(), about the middleware approach you mean to check which route is at the moment and render is layout? instead of using folder structure?

You shouldn't check the parameters in that way, only return not found if that page doesn't exist

what is that... Since you are using a CMS, just do the following:

const page = await getPage(params.slugs) // something provided by your CMS

if (page == null) notFound();

return <MDXPage>...</MDXPage>; // render the page