What is this following my cursor and how do I get rid of it?

Development Rendering
, , , ,
2

268358-ue4editor-2019-02-12-10-43-12.jpg
268358-ue4editor-2019-02-12-10-43-12.jpg1267×888 227 KB

Please… How do I get rid of it, I’m losing the plot! It follows my cursor everywhere!!!