You can delete all annotations or a single annotation in PDF Reader Pro. There are several ways to delete annotations.
Delete All Annotations
1. Click Annotation in the left panel -> tap the icon on the top and hit Delete All Annotations -> click OK;
2. Or click one of the annotations in the left panel, then press the shortcut Ctrl + A -> right click and tap Delete.
Delete a Single Annotation
1. Right-click on the annotation on the reading page -> Delete;
2. Or click Annotation in the left panel -> choose an annotation and right click -> Delete.