This thread is resolved. Here is a description of the problem and solution.
Problem: How to show more than 100 strings at once (String Translation) Solution: If you set to show 100 through the dropdown, the url would be like: wp-admin/admin.php?page=wpml-string-translation%2Fmenu%2Fstring-translation.php&strings_per_page=100. And then try changing this number directly within the URL to something like 500. Relevant Documentation: https://wpml.org/forums/topic/is-there-a-way-to-delete-more-than-100-strings-at-1-time/#post-1212562
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