Generally the terms you are looking for are horizontal width and vertical height. In the service menu they may be called "hwdth"/"vht"....something like that. Depends on what they decided to call it.
There's no way to know for sure unless you have the service manual for that particular TV that details all the service adjustments.
And just a note....you need to be in the *service menu* to access these adjustments. It won't be in the user adjustments (brightness,color level, tint, etc). Service menu access is generally a sequence of keypresses on the remote.