This is my first time posting here so feel free to correct me if I you should approach this issue in some other fashion.
I love the new way Premiere Pro works with captions and it has really sped up my workflow. However I have one issue with how the background of the subtitles work. I am able adjust the size of the background box around the text, but I am not able to adjust the height and the width independently. This forces me to add spaces to the start and end of each line to manually create more padding on the sides. This workaround adds up to a substantial amount of time.
I have attached a video if I haven't explain what I mean well enough.
It would great if you could add this functionality! Please enlighten if I just haven't found the right buttons 🙂
I hope they will improve it. I have the same problem. I need to put subtitles into video with different subtitles (burned in). So I have to hide old subtitles behind background of new subtitles but I would neeed to be able to change horizontal size of background, what is (unfortunatelly) not possible 😞
For that I think I would put a graphic over that section. And yes, a pain to cut that graphic up, but you could just step through the caption track and cut/delete a single graphic the length of the video.