[Koha] Merge Bib Records - Where is the Merge Button?

[zefanja]

Hello,

maybe I'm blind, but I can't find the button to merge records. The
manual says to search for a record, select the ones you want to merge
and click the Button "Merge selected" at the top. But I don't see that
button. I'm using version 18.05

Thanks for your help.

Regards,
Stephan