I am using ArcMap Desktop 10.5.1. When I opened my computer today I found that I can no longer see the Network Analyst Toolbar. It is not grayed out, it simply will not pop up on my MXD whenever I click on the toolbar from Customize (or Customize Mode). I have tried resetting the toolbar, but this won't work either (see images below). All of the other Toolbars are working just fine. Only this tool gives me issues. Does anybody have any idea how to solve this?