Update

components/layout/Sider.tsx

@@ -215,7 +215,7 @@ class Sider extends React.Component<SiderProps, SiderState> {
       parseFloat(String(collapsedWidth || 0)) === 0 ? (
         <span
           onClick={this.toggle}
-          className={`${prefixCls}-zero-width-trigger-${reverseArrow ? 'right' : 'left'}`}
+          className={`${prefixCls}-zero-width-trigger-${reverseArrow ? 'right' : ''}`}
         >
           <Icon type="bars" />
         </span>

components/layout/style/index.less

@@ -111,10 +111,6 @@
           background: tint(@layout-sider-background, 10%);
         }
 
-        &-left {
-          right: -@layout-zero-trigger-width;
-        }
-
         &-right {
           left: -@layout-zero-trigger-width;
         }