Scholar Background, Assurance (Occultism) and Gnome Obsession
 

I'm building a gnome Wizard, and taking Gnome Obsession as a racial feat to increase my proficiency with Arcane roles, along with the Scholar Background to give myself the Assurance feat.
The problem is that Gnome Obsession seems stuck with Academia, and I don't see any way to change my selection for Assurance away from Occultism.
What am I doing wrong?

The assurance skill won't be able to be changed. It's going to be for whatever skill you take under Scholar on the Skills tab.

Gnome Obsession grants Lore skill. You'll need to click the + icon at the upper right and add a Lore skill to your list.