Imported DWG file bright blue?

Hi there. I have imported a DWG file from cad of a building to sketch up and it’s bright blue. I can’t seem to change the colours. I’m a complete newbie so thanks for any help.

Is it currently selected? By default the CAD linework comes in as a component (like a CAD block) and if selected, selects everything and highlights blue. You can explode it by right-clicking and selecting ‘Explode’.

thankyou. got it thanks.