I am trying to make a video of my workouts. I take all my videos on portait mode. After placing some clips on the timeline, I noticed that are clips are normal meaning they don't have the black bars, and others have the black bars and vertical. Is it within my phone settings or vegas ?
Probably in both. Make your Vegas projectsettings with the resolution of the most used clips and try to remove the black bars with the "Pan/Crop" tool and/or Trackmotion ( in the trackheader).
Are the clips that have black bars displayed right side up or are they rotated? If they are right side up, are they distorted to very tall and skinny, or do they look normal proportioned? If they look normal and are right side up then they were taken vertically with the phone. If they look tall and skinny then you can use Pan/Crop to uncheck 'maintain aspect ratio' and they should stretch out to fill the frame. If they are rotated then you can use Pan/Crop to rotate them back to upright.