matching cropped ratio to project ratio

I have a project that is 1080x1920. In the project i have cropped all clips to what I want. (Keep in mind I come from the photoshop/lightroom world where you are free to crop to whatever you want). When I share the end video it adds black bars (top/bottom) so it is still 1080x1920 with black bars on top and bottom). I can't figure out how to change the project ratio to match to cropped clips ratio. (all clips are the same ratio). I can see the project ratio in the properties or inspector panel but I cant figure out how to see the ratio of individual clips. In addition, if I try to apply ken burns to a clip, the frames revert to the full project ratio, not my cropped ratio... Help please...