The pause-drawing, refresh, and data/layout toggle buttons have disappeared from my view window. I'm using ArcGIS Desktop Standard 10.4.1. I've not upgraded recently or made any changes to the ArcMap configuration. I recognize there are other ways to accomplish these tasks, but I enjoy the convenience of these tools in the lower left corner of the map.
I'm not aware of this button configuration being a toolbar, but I did search through the toolbars unsuccessfully.
These tools are available in 10.4.1. See here.