Boot to Amazon Kids+ environment on Fire after factory reset

I purchased an Amazon Fire Kids tablet a few years ago (just about 6 months past the 2 year guarantee window). One of the key features is that on start-up, it opens the **Kids+** environment and remains locked to it unless it's bypassed via a password. Recently, the device crashed and needed a factory reset. It's now up and running again, but as a regular Fire. It has the kids profile on it and the Kids+ app installed, but it doesn't open it on boot and stay locked on it. Is there a way to get that setting back?