This thread is resolved. Here is a description of the problem and solution.
Problem:
You have added a fifth language, Hindi, to your multilingual website, but the language icon is not displaying in the menu.
Solution:
1. Ensure that the page you are viewing on the frontend is translated into Hindi.
2. Verify that the status of the Hindi language pages is set as 'Published' and not 'Draft'.
3. Confirm that the Hindi language is not hidden on the WPML >> Languages page.
If these steps do not resolve the issue, please add a debug report in the Debug Information box. We have enabled the debug info box for your next reply: https://wpml.org/faq/provide-debug-information-faster-support/
If this solution does not apply to your case, or if it seems outdated, we recommend opening a new support ticket. Additionally, 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.
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