SEAMLESS TRANSITIONS - I cannot change the resolution of the transitions PLEASE HELP

I am editing a video for IGTV at the moment and I cannot get the transitions to change resolution. I have tried doing what is instructed in the video shown as ‘example’ but when I drag and drop the transitions in the sequence, they are still 1920 x 1080 format as opposed to 9:16 which is what I need.

I have noticed a lot of people having this issue on various forums and nobody has an answer. Please help me understand what is going on and how I may fix this.
Thank you kindly

You need to speak to the author of whatever content you’re using. They’re going to be the best person to advise…