Can use Webform for add combobox for select language on the site? I want to know how I can add a combobox to a page. For example, on the front page, I want to add a combobox for selecting the language. I use the default modules for creating multilingual sites. Languages ​​are displayed as a list on the page. I want to display a combobox instead of the extended list.
Can I do this with the Webform module?
No, you can't do this with webform. Webform's purpose is to collect and store user submitted data.
You can create a language dropdown by creating an override template for links--language-block.html.twig in your custom theme.