bug fix

index.js

@@ -217,9 +217,10 @@ class SideMenu extends React.Component {
   onLayoutChange(e) {
     const { width, height, } = e.nativeEvent.layout;
     const openOffsetMenuPercentage = openMenuOffset * width;
-    const openMenuOffset = width * this.state.openOffsetMenuPercentage;
+    const openMenuOffset = this.props.openMenuOffset === undefined ? width * this.state.openOffsetMenuPercentage : this.props.openMenuOffset;
     const hiddenMenuOffset = width * this.state.hiddenMenuOffsetPercentage;
-    this.setState({ width, height, openMenuOffset, hiddenMenuOffset });
+    this.setState({ width, height, openMenuOffset, hiddenMenuOffset, openOffsetMenuPercentage });
+
   }
 
   /**