Good day Timur,
Since the focus outline appears without pressing Tab and remains across different Windows versions, another connected input device may be sending navigation commands.
Here are some suggestions you can try:
- Disconnect all game controllers, joysticks, steering wheels, USB receivers, and Bluetooth input accessories.
- Restart the computer with only the laptop keyboard and touchpad connected, then check whether the outline still appears.
- If the issue continues, temporarily disable the touchpad in Settings > Bluetooth & devices > Touchpad, connect a basic wired mouse, and test again.
- If the problem disappears, reconnect the disconnected devices one at a time and test after each one. This should help identify which device is triggering the behavior.
Please let me know how it goes after trying these steps, and I'll be glad to continue looking into it with you.