Help for Multilanguage Site

Hi folks,
I’m currently working on making my site multilanguage. For this I’m using WPML plugin. With this plugin, you have different urls per post, category, tag and pages. and all are tied to original content.
But, in both language default template is used.

my site is https://elisidunyamiz.com/ a handcraft site in turkish language.
it will be in english also, and the url will be https://elisidunyamiz.com/en/

But I want to use different templates per language. I can edit templates, and create secondary ones for english. For turkish, the default template will be used, but I don’t know how I can set templates for english.

Is there an easy way to call a different template from the default index.php when user enter https://elisidunyamiz.com/en/ ?
say i created a seconday index-en.php and I want to call it. how can i achieve this ?

Or could you please guide me what is the best way for this situation ?

Thanks all taking your time