Currently, there is a lack of a 'drag and drop' UI builder specifically for electron apps. Users are required to input HTML, CSS, and JavaScript manually. However, there is a workaround available where users can utilize existing drag and drop website builders such as WordPress or Squarespace to create the frontend layout. After generating the static assets like css and html files from these builders, users can then manually integrate JavaScript code to add necessary functionality to their electron app.
Please note that this workaround may not provide all the functionalities desired but it serves as a temporary solution in the absence of a dedicated 'drag and drop' UI builder for electron apps.