The Main toolbar is at the top of the CopyCAD window, under the menu bar. It consists of buttons whose order, reading from left to right, reflects the sequential stages you can use to create surfaces from digitised data, and to check their accuracy. When creating surfaces, you are advised to work through the various procedures in the order that they are presented on the toolbar.
Each button either opens a dialog box or displays a side toolbar. The names of the buttons are listed below: click on the links to find out what each button does