[已解决] Migrating with WPML + WP all import

Background of the issue:
I am trying to migrate with WPML and WP All Import. When importing categories or posts, there is no button to choose the language in WP All Import. I have updated all three plugins (WP All Import, WPML main plugin, WPML WP All Import). I have deactivated all plugins. Also didn't work. Link to a page where the issue can be seen: 隐藏链接

Symptoms:
There is no button to choose the language of the imported content.

Questions:
Why is the button to choose the language of the imported content missing?
Is there a compatibility issue between WPML and WP All Import?