There appears to be a conflict between Dynamic.ooo (Version 2.8.1) and Advanced Custom Fields Extended (Version 0.8.8.11) that causes infinite loading in the Elementor editor.

Ultimate Addons for Elementor is causing infinite loading in Elementor if too many widgets are activated.

Essential Addons for Elementor is causing infinite loading in Elementor if too many widgets are activated.

Disable until a future version fixes this issue.