Hi, writing this from a Leap 15.1 which automatically connected to a hidden SSID WiFi router, so what you need is definitely possible.
Maybe a detailed description of what you actually did to configure WLAN0 and then WLAN1 might help; do you have more than a WiFi card in your system?
Please be aware that a clear title in the “Network/Internet” subforum is more likely to attract the experts you need than this thread in the Install subforum…