To erase drawings in a PDF using UPDF, follow these steps: Open your document in UPDF and click the Comment button on the left sidebar. From the top menu, choose the Eraser tool. Adjust the eraser size and select between Partial or Whole erasing options based on the area you want to remove. Once you have selected the appropriate settings, proceed to erase the drawing or annotation from the document. After completing your changes, be sure to save the file to retain the edits. This method is quick and efficient for cleaning up annotations.