去掉Riboon标签页一栏最前端的按钮，使用属性：ShowApplicationButton=False。

FactoryTool/FactoryTool/MainView.Designer.cs

@@ -53,6 +53,7 @@
             this.ribbonControl1.OptionsMenuMinWidth = 385;
             this.ribbonControl1.Pages.AddRange(new DevExpress.XtraBars.Ribbon.RibbonPage[] {
             this.RBPAGE_MAIN});
+            this.ribbonControl1.ShowApplicationButton = DevExpress.Utils.DefaultBoolean.False;
             this.ribbonControl1.ShowToolbarCustomizeItem = false;
             this.ribbonControl1.Size = new System.Drawing.Size(884, 160);
             this.ribbonControl1.Toolbar.ShowCustomizeItem = false;