[simracingsystem]

I have checked your account for errors, sometimes fixes some glitches but you should delete your launcherdata folder at mydocs/assetto corsa.

You must be using an unusual resolution. You can adjust the size of the iframe at

C:\Steam\steamapps\common\assettocorsa\launcher\themes\default\modules\srs\srs.html
search for width=" and reduce it.