This thread is resolved. Here is a description of the problem and solution.
Problem: I have built a custom Elementor Pro Header with a logo, navigation and contact button. When I create translations of the header, the button URL field is not visible
Solution: CLIENT UPDATE: I have just translated the HEADER itself, until now I only had an English version and now the buttons URLs do translate.
Relevant Documentation: - https://wpml.org/documentation/plugins-compatibility/elementor/
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