I tried creating a new sequence (within the same project - File/New/Sequence) but the sequence settings for even that is grayed out.
You easily can create a new sequence that matches
your 1920x1080 footage in two ways:
- Right-click a media file and select: New Sequence From Clip
- Or, do this:
Once you have created a new 1920x1080 sequence,
you can copy and paste the clips from your incorrectly
formatted, already edited sequence into the new sequence.
If your improperly formatted sequence was also the incorrect frame rate,
be sure to go through your new sequence to check for lost transitions
and / or gaps in the timeline.