In 1.9.0 Save IFC file command added.

You can save an IFC file that you opened and modified by clicking the ‘Save(S)’ or ‘SaveAs(A)’ command in the main ribbon bar. ( You can’t delete structures yet. Also, the BEAVER can’t change the semblance of the structure immediately, whereas you modify geometry properties. Please reopen the file.)

In order to change value, Please press ‘Apply’ button in the property view after changing values.