Currently, the Insert Image Dialog for the editor labels doesn't look great. the first two seem right-aligned and the second two items seem left-aligned. this screenshot is from the demo site.
Hi Stewart,
Indeed, this popup should look better out-of-the-box.
In the meantime, here is a workaround. The KB article is for the Grid popup edit form, but the required CSS code is exactly the same:
.k-window .k-form-horizontal {
    min-width: 600px;
}OR
.k-window .k-form-horizontal .k-form-label {
    white-space: nowrap;
    margin-left: 10px;
}Regards,
 
Dimo
 Progress Telerik