Help! Suddenly a double track with change in tools and cannot export to mp3. What did I do?

Can someone help me please? I have been using Audacity for a bit and suddenly now there is this double track. Plus although I can record, the recording will no longer export to mp3 and other. Rather it will only export to WAV. Plus the tools are different.
Obviously I pushed some wrong button I guess but I am still new to audacity and I cannot figure this out.
Thanks very much.

Kate - they updated Audacity and some of us aren’t too thrilled with the changes. The one you describe threw me for a loop and the “solutions” provided here were too complicated for me. I and others have deleted the new version of Audacity and re-installed the previous version–which I was using last night and tonight and am SO thrilled it’s back to “normal.”

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