WotLK Black borders on the side

[KingJyrinx]

Hello I run windows 10 and i do have a question on to how to get rid of the black borders in full screen if you have any info that would help much appreciated

[badekodeine]

i had this problem tonight as well. prior to logging in, go to "options" on the side bar and then "video" and adjust your resolution to the correct size. i adjusted mine to 1366 x 768 and it fit perfectly to the screen. granted higher resolution might result in relative glitching of the screen temporarily depending on how fast your computer is.
hope i helped