Glyphs 4: Change Sidebearings with Transformations Filter (at export)

Hey!
On Glyphs4, I am not sure I understand how to change sidebearings with a transformations filter at export (Filter in the Instances Tab). The description of the Filter is still the same as in Glyphs3, but with the new UI inside the Filter I don’t see where I should write “LSB: ±‌shift*; RSB: ±shift*;” ?
Thanks!