Issue with exporting 1080

[Jed35172425rvwp]

Hi! I noticed when I upload my reels to instagram and tiktok its quite blurry. Apparently I have to upload in 1080p. For whatever reason its at 2160. And when I try to change it to 1080p it adds big black bars around the video. Im quite new to this, sorry if its a noob question. Can anyone help me get 1080p export by default without getting this issue? Attached images so you can see what I mean. 

[Ann Bens · Accepted solution]

1080p means its widescreen (hence the black boxes) 1920x1080.

You need to set it to 1080x1920 as in portrait mode.

[Jed35172425rvwp]

That option isnt avb 

[Ann Bens]

You need to type in the numbers manually under custom.

[Jed35172425rvwp]

It wont let me get, if i type in 1080 it auto changes the other to 608. cant get it to 1920

[Ann Bens]

Did you unlock the setting first?