HELP - SU15 no legacy interaction system available

Yesterday, after a long absence, I started MSFS on my PC again and updated it to SU15. So far I have flown in Legacy Cockpit Interaction mode, but to my surprise this mode is no longer available under General Options - Accessibility. I can only switch between Classic and Locked mode, Legacy is completely missing. I have studied various articles on this and deleted all my mouse profiles. I only have the default mouse profile left and reset it to default. However, the Legacy Mode does not come back and I still only have Classic and Locked available.

I really don’t know how to get Legacy Mode available again.

I would be very grateful for a workaround to solve the problem and thank you for your support.

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