Hi, are you still on the free version, or are you now paying for the service?
It may be either that once the free year has expired then the ability to save a config must be paid for, or that it has always been a "pay for" feature

Set Up Your Webcam

1. Open XSplit Broadcaster.
2. On the bottom of the screen, you’ll see the Scene options. Click on Scene 1 (or any scene you want to set up).
3. Click the Add Source button at the bottom.
4. Navigate to:
Devices > Video > [Your Webcam Name]
5. Your webcam feed should appear on the screen.
6. You can resize and move the webcam window to where you want it.

Add the Lovense Interface to XSplit

1. Open XSplit Broadcaster.
2. Click Add Source > Screen Capture > Window Capture.
3. Select the Lovense Connect app window from the list.
4. Resize and position the capture window on your stream layout.

If you don’t want viewers to see it, just keep it off-screen or hidden.

Step 5: Save Your Setup (So You Don’t Redo It Each Time)

Once you have your webcam and Lovense sources positioned.
Go to File > Save Project As (what ever you want to call it)... and save it.

Next time, open this project, and everything should load with your devices ready.

Troubleshooting
Lovense window not showing in XSplit? Run both apps as Administrator.