**System Information**
Operating system: Win10 Pro
Graphics card: GTX 560 Ti
**Blender Version**
3.1
**Short description of error**
Blender always forgets the following settings every time it starts, even for a file saved with such settings:
- Stereo mode defined in the Window / Set stereo 3D tab,
- Convergence Plane Distance value defined in Camera / Stereoscopy in the mode Off Axis.
**Exact steps for others to reproduce the error**
Set values, exit and restart, or set values, save file, exit, restart and load saved file.