[Koha] output of authors' subfields

[Сычев Игорь Алексеевич]

Hello!

How to do if 7xx $g and $b are filled, output only $g? 
Both subfields are being displayed now.
Is this reaction only in Unimarc?
Example:
700 
$aAufderstraße
$bH.
$gHartmut

https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=667189
https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=22141
https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=634386

Good Luck!

Igor A. Sychev
Tomsk Polytechnic University
https://lib.tpu.ru