This thread is resolved. Here is a description of the problem and solution.
Problem:
The client is noticing an extra URL parameter (?_gl=) appended to your domain name on the home page and is wondering if it can be changed or removed.
Solution:
We have identified that the parameter (?_gl=1%2A4osfvv%2A_ga**) originates from Google Analytics and does not affect your site's functionality. For more information, please refer to the following Google documentation: Google Analytics Documentation. Additionally, you can check related issues and solutions on our forum:
If this solution is outdated or does not apply to your case, we highly recommend checking related known issues at WPML Known Issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should you need further assistance, please open a new support ticket at WPML Support Forum.
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This topic is split from https://wpml.org/forums/topic/different-domain-per-language-not-working-2/