[Koha] 3.8.4 staff main page

[Paul]

The first staff page in 3.8.4 after logging in has a tabbed search box at 
the top that "defaults" to patron checks - our staff has asked me to change 
this to the fourth/last tab "catalogue" as they cannot find a "preference" 
anywhere.

Does anyone happen to know where the code for this might be found. I had a 
quick, unsuccessful, look around with firebug, so it would be most helpful 
if someone could point me towards the relevant perl or template file.

Many thanks - Paul