The only "box" i see is the tooltip. Although I do have the aperture box turned off, thats the only other "box" that comes to mind.
A picture is worth more than a thousand words in this case......
ACADuser
Civil 3D 2018, Raster Design 2018
Windows 7 Enterprise
Dell Precision 5810 Workstation
Intel Xeon E5-1630 v3 @ 3.70GHz
32GB RAM, NVIDIA Quadro K2200 4 GB GDDR5
DUAL 27" Dell UltraSharp U2713HM