help please members, i have just fitted a x5 wide screen in my e39 m5 and done the adjustment thanks to frits post

, here is my question, on opening door splash screen is full width but with key on it reverts to my problem,i have a 20mm band on both sides of screen on all menus and have the setting to adjust between split and full but this makes no difference installed a mk3 cd drive first and lastly the screen my version is 3/1/63 any ideas lads n lasses