If you want to check views opened in the project file, you needed to click on “Switch Windows” icon on the Quick Access Toolbar.
But, Revit 2019 offers view tabs as a new feature above the Drawing Area part.
A View icon is displayed by a view type on the view tab, so you can easily know a view type without opening a view.
When you open a file in Revit 2019, you can easily know a Revit version of the file. Revit has not offered any file version info on the open popup window until Revit 2018, but this has been implemented in Revit 2019.
I am not sure whether it is a bug or not, but sometimes some leader arrowheads of tags look weird in a specific view in Revit. In other views, same leader arrowheads and tags look ok, so I believe it is not a matter of the leader arrowhead itself.
For example, the leader arrowhead of the room tag is a dot, and most views do not have any problem, but it looks weird on a specific view like the image below.
To fix this issue, you have to manually drag a blue dot control point at the midpoint of the leader like the image below. Once you drag it to somewhere, then the graphic issue of leader arrowhead will be fixed.
If you want to have exactly same graphical expression of the leader, you can simply drag it back to the original position.
When you export DWGs in Revit, filled regions are not exported correctly if some filled regions overlapped each other on the views. Here is a example.
In Revit 2017, there are floors which patterns were applied, and also another filled regions on the top of those floors.
If I export a DWG file from this view, some patterns will not be exported correctly. This is what it looks in AutoCAD.
To fix this issue, you should change the Visual Style of the view from Hidden Line to Wireframe.
Once you change the Visual Style and re-export the view, then you will get a DWG file which has all patterns are exported correctly.