Hi
VP 10.43.....
"........I have a 1920x1080 video and I want to maintain the height and just remove the sides so the final product is 960x1080........."
OK.....Here it is on Track 1.....

".......and I want to maintain the height and just remove the sides so the final product is 960x1080........."
OK..... 960 x 1080 is an AR of 0.8 or approx (4:5)
So, add a Crop effect of AR 4:5 (it's on the list of crops) and set the X2 value to 80 (0.8 of 100% width which centres the cropped area)

Result is a video 960 x 1080. Unless you want to squash it you HAVE to lose the side areas.
Is this what you want??
Nat