TYPO3: RTE Full screen button
Normally, when you hit the full screen button in the htmlAREA RTE, the text-area doesn’t go full screen at all. Instead most of the time (depending on your browser and TYPO3 version) you’ll get this half full screen text area which is really not helpful at all. To fix this, past to following line into your TSConfig field in the parent page or folder.
TCEFORM.tt_content.bodytext.RTEfullScreenWidth = 100%
