https://wordpress.org/plugins/formget-contact-form/
This plugin does not limit its admin CSS and JavaScript to its own admin pages. These styles and scripts cause the admin pages for Connections to mo longer appear and function correctly. The plugin devs have been notified of this issue in their support forums. At this time there is no fix other than deactivating this plugin.
NOTE: This FAQ was written based on FormGet Contact Form 5.3.5