The Show Annotations option was added in iOS app version 188.8.131.52 and Android app version 184.108.40.206.
To use this feature, please be sure to update the app to the latest version.
How does the Show Annotations option work?
Show Annotations option is the option to let you show or hide inputted annotations such as handwriting, images, and text.
You can find the option by clicking the Document Viewer Options icon at the top right of the Document Viewer(iOS , Android) and then enabling (Show Comments) or disabling (Hide Comments) the Show Annotations option in the Reading Option section.