To make the Text Editor/TinyMCE "sticky" insert this CSS code to Divi > Theme Options > Custom CSS box and click the green "Save Changes" button to save changes:
/* Start Divi sticky Text Editor */
.mce-panel .mce-stack-layout-item.mce-first {
position: sticky!important;
top: -64px;
}
/* End Divi sticky Text Editor */
Now all commands to format the Text/Content will always be available when you scroll longer content in the Text Editor mode, as seen in the screenshot below:
