You can modify the property of the annotation by the Annotation Properties Panel. You can view PDF documents with the Annotation Properties Panel displayed or hidden. If you close the Annotation Properties Panel, you can expand the reading area.
1. Click Annotete on the toolbar and tap any annotation tool, the Annotation Properties Panel will pop up on the right side;
2. Show or hide the Annotation Properties Panel, just click Properties 
on the top right.
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