RVDB

Problem:
The client wanted to add a language switcher at the top of every page on their website to make it easier for readers to switch between Dutch and English. Additionally, the client reported an issue where the page layout changes when switching from Dutch to English.
Solution:
We recommended adding a MENU language switcher to appear at the top of the page, next to the menu. This can be done by following the instructions in our documentation:
https://wpml.org/documentation/getting-started-guide/language-setup/language-switcher-options/#add-a-language-switcher-to-a-menu-footer-or-widget
Regarding the layout change issue when switching languages, we informed the client that we handle only one issue per ticket as per our Support Policy. Therefore, we created a new ticket to address the layout change issue separately.
https://wpml.org/forums/topic/split-when-i-switch-from-dutch-to-english-the-whole-page-layout-changes/

Please note that the solution provided might be irrelevant if it's outdated or not applicable to your case. If the issue persists, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If you still need assistance, please open a new support ticket in our forum: https://wpml.org/forums/forum/english-support/.