Kiwi Story is a pretty big project! Probably best to mess with the two beginner tutorials more.
Here's how I dug into it...
First I was looking for the events that control inputs. The ePlayer event sheet seemed like a good bet so I started there, and indeed there was a "Player Input" group. This group looked like it had various input methods like keyboard and gamepad doing the same thing, calling the player move/turn functions. The functions I found in the next section below, where I could see that movement used the platform behavior, on the Player_Base object. So the Player_Base object is the one with the platform behavior settings. I found under Object Types > Level Objects > Player > Player_Base.
However when clicking this you might see that all the properties on the left says "No Instances", so we need to find where this object is placed on a layout in the project to set the defaults. You can do this by right clicking the Player_Base object and then "Find all references". The first entry shows that it is on the ObjectBank layout. So open that layout, then you can modify the default platform behavior properties.
Note that half of the above complexity was digging/searching through the organizational structure of someone else's project, you normally would know where things are set in your own project!