One of the things that has changed in the 2019 version of Autodesk Revit from 2018 that you might have missed is the Close Hidden Window option disappearing, or rather it has changed to Close Inactive Views.
You can see the different way in which this function is now displayed in the toolbar with the images above. However, it functions in the same way, closing all the views except the active one.
If you are missing the Close Inactive Views icon from the Quick Access toolbar you can just right click on the tool from the View Tab and select Add to Quick Access Toolbar.
If you are looking for extra functionality for your BIM workflows then the Graitec Advance PowerPack for Autodesk Revit should prove very useful. If you have any other enquiries, please send us a message now.