First off, thanks for buying the package. We appreciate it!
I just double checked the package. By default in that scene, the AI visualizations are turned off for all the soldiers. To turn it back on, select the soldier you want to see, then notice in the AI Rig editor, to the right of the title “AI”, you will see two icons. One is a red question mark (help icon). The other is a set of shapes that is greyed out. Click the greyed out shapes and they should go back to a colored/active state. That icon turns on and off visualizations.
Note that there are separate visualization icons on the sensors themselves. The main AI visualization toggle will override that, so both need to be on. In the BigBattle scene, the sensor visualizations are already turned on, so you just need to toggle the icon on the rig.