In Microsoft Dynamics NAV 2016 Web and Tablet Client, we can use Freeze Pane. We cannot configure it in Web Client, but we can use it here. If you want to configure Freeze Pane, you have to do it in Windows Client.
If you do not specify Freeze Pane, system will froze the first columns by default in Web and Tablet Client. Web Client is not so clear as Windows Client and this small feature is the important to make Web Client more used.