How to delete blue green and red arrows and curve that appear at centre of design

It appears on my latest upgrade that there is a red and green arrow and a blue curve at the centre of my design work. It really drives me nuts and i cant work out how to get rid of it. Any help would be appreciated…

Most likely you saved one of your files as startup template. (To find out where templates are located you can go to Options button - Rhino options - Files.) Just delete the curve, and save it again as default template (File - Save as template).

that’s the gumball… you can turn it off in the toolbar:

The gumball will only appear when the object is selected. You may find, it’s more of friend than a nuisance.