You can choose to display your units in either the metric or imperial system. To do this open the Preferences panel by clicking on the circle with either your photo or initials, at the top of the right hand toolbar), select Preferences and choose either Metric or Imperial.

NOTE: The change will on apply for the project that you set it for. If you are a member of other projects they will have to be changed separately. The change will also only affect your view, if your teammates want to change their display units they will need to do it for themselves.