This article describes an issue loading the edit UI in Episerver DXC. For example loading is not completed when attempting to enter "All Properties".
Such an issue can occur in EPiServer DXC if the UIEditorCssPaths attribute is set programmatically - for example:
Settings.Instance.UIEditorCssPaths = "/Static/css/editor.css";
Setting this attribute programmatically when running on EPiServer DXC is not allowed. Instead configure the attribute in episerver config.
More on UIEditorCssPaths