This is a known issue,
From the blog:
"[NEW] Navigating to Settings > Power will crash Settings on this build. As a workaround, you can use commands to configure power modes on your device. powercfg /overlaysetactivewill set the active user configured power mode, powercfg /q OVERLAY_SCHEME_CURRENT will get the active user configured power mode. For more information on using powercfg to adjust these settings, click here."