Webflow does not have a built-in way to create locale-specific page or sections.
For example let's suppose your primary locale is English, and you have Dutch as a secondary locale. What if you want a page that only exists in the Dutch locale? Or only in the English locale?
The problem is more complex than you think, because it involves
It also raises some ambiguities;
Our preferred approach is to keep it simple. We let the pages overlap 100% but we customize irrelevant pages depending on what the client needs.
One approach is to take your non-existant page and return an error message, plus an explanation like "this page only exists in Dutch, click here to view it."
Or you can simply redirect. This can make sense if there is only one possible answer to the page they've requested.
The downside to this is that users who somehow arrive at that page will be locale-switched to the target language.
The basic mechanic here is to use custom CSS and the :lang() pseudoselector to manage what is displayed for each language.
Let's say you have a large page where the body content only makes sense in Dutch. You can decide to hide that entire section of the page by assigning a class of en-hide with custom CSS like;
.en-hide:lang(en) { display: none; }