I noticed when I select the "Render As.." option to render my video in Windows 10, the contents appear to stretch below the bottom-right of the dialog, so I can't select OK to save, or anything on the bottom-right, or even adjust the file name.
Onebuck Its a bug unfortunately. Hit enter will start the rendering. I guess your'll need to rename once the renderings finished, ready for the next job till a fix is put in the next build (hopefully)