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Create a new Sequence with the settings you prefer,
then Copy > Paste the clips into the new Sequence.
Be sure that your Sequence settings match your footage by doing this:
Or, right-click a media file and select 'New Sequence From Clip".
How do I choose the right sequence settings?
You may need to re-create audio effects that you applied in the Mixer
in the first Sequence, or you can use your first Sequence as a mixed,
nested audio track for the new properly configured Sequence.
it’s as simple as creating a new sequence with the right settings and importing the old sequence
No, no. Create the correct sequence and copy/paste everything into it.
Some of the video keyframes may need adjusting, too, won't they?
Since the only issue the OP mentioned was frame size,
I assumed the proper frame rate was used.
But if not, then yes (along with adjusting edit points).
A huge thanks to everyone !! I followed all your advice and got it to work, The only thing I had to do was manually resize the titles but everything else was perfect, THANK YOU !!