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After latest Google Chrome browser update a new issue arose with menu display. 
Please, check this article https://mikado.ticksy.com/article/11648

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We got feedback from our developers regarding debugging Split Screen and Contact Form 7 conflict. The issue is caused with latest Contact Form 7 plugin's update, and some changes are causing the issues with our Split Screen Functionality. Also, our developing team needs to contact plugin authors for precise info about plugin update so Split Screen is fully compatible with it, and as a solution for now you can use previous version of Contact Form 7 plugin.

Just delete existing version and download older version from next link https://wordpress.org/plugins/contact-form-7/advanced/ at the bottom of the page and download 4.5 version 

We have tested that version's compatibility with Split Screen functionality and we can confirm that it works fine.

Please let us know if there is anything else we can do for you.