Can you please tell me where to locate this tool bar with the crop command on it?
You can always invoke toolbars with View>Toolbars. In this case, with View>Toolbars>Image.
If you click your picture so that it is marked, the toolbar should automatically appear.
Tested in Draw.
With me Windows 10 Home; Version 1809;
64-Bit | LibreOffice, Version: 6.2.3.2 (x64).