This thread is resolved. Here is a description of the problem and solution.
Problem: Contact Form 7 forms disappeared after WPML plugin activation Solution: I've increased memory limit allocated to WordPress (it was below our minimum requirements https://wpml.org/home/minimum-requirements): https://wordpress.org/support/article/editing-wp-config-php/#increasing-memory-allocated-to-php
And I have also performed all the troubleshooting functions:
- WPML - > Support -> Troubleshooting: -- Clear the cache in WPML -- Set language information -- Fix terms count -- Fix post type assignment for translations
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