What is the macro to fix in game graphics for WoW

If you simply wish to reload your User Interface to get rid of bugs, a simple /reloadui will work to that effect.

The following macro will put all your graphic settings to high:

/console overridefarclip 1
/console farclip 1600
/console horizonfarclip 6226
/console groundeffectdensity 256
/console groundeffectdist 140
/console smallcull 0
/console skycloudlod 3
/console characterAmbient
/console extshadowquality 4
/console environmentDetail 2

And the following macro will put them all to low:

/console overridefarclip 0
/console farclip 1277
/console horizonfarclip 2112
/console groundeffectdensity 96
/console groundeffectdist 140
/console smallcull 0
/console skycloudlod 1
/console characterAmbient
/console extshadowquality 2
/console environmentDetail 1

You can still hit Escape, and go to the Video options to alter these settings manually.