Why does a 720 x 1280, 30 fps vertical project look so much slimmer in FCP than in Motion 5?

I have been using FCP to edit down videos that will end up as "Shorts/Reels/TikToks" for social media. I watched a tutorial that showed me to locate the original 1920 x 1080 project in FCP, then right-click on it > Select: Duplicate Project As... and when the settings box opens, simply select Vertical in the Video dropdown.

This does a little rendering, but then... out pops a project that is perfectly in this "Social Media" format. I've done this many times now.

But... today, I wanted to create a little "Title" sequence in Motion that I can import into FCP to use for these videos. In Final Cut Pro, if I go to one of these "Vertical" projects, and view the project settings, I see that they are all 720 x 1280 30 fps.

So... I open Motion, and create a new: Project/Title/Generator, giving it those same dimensions, 720 x 1280, 30 fps. But when the project opens in Motion, it looks like completely different dimensions. In FCP, 720 x 1280 looks like the dimensions of an iPhone. But in Motion it looks much wider. I must be missing something very obvious.