NavigationDrawer is a sliding panel menu that comes out from the edge of the window and allows to have the contents in a hidden panel. It can be shown by swiping from any of the four screen edges or by demand.
For know more about SyntaxEditor : https://www.syncfusion.com/winforms-ui-controls/navigation-drawer
SyntaxEditor user guide documentation : https://help.syncfusion.com/windowsforms/navigation-drawer/overview