London 2017 managing director Sally Bolton quit this week while two other board members left their posts amid reports of differences with chairman Ed Warner.
A statement on Friday said Warner, who is also the head of UK Athletics which is responsible for the day-to-day delivery of next year's championships, would now work with a co-chairman appointed by the Greater London Authority.
"London 2017 Ltd has agreed a number of governance changes following a thorough review to ensure a clear separation of the day-to-day delivery led by UK Athletics to a more independent board with strategic direction and oversight of the championships," the statement said.
UK Athletics chief executive Niels de Vos takes on the position of championships director for the event and will be accountable to the London 2017 Board.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
The re-structuring was welcomed by UK Sport.
"This new structure will ensure that we can more clearly separate the oversight function of London 2017 Ltd from the delivery function of UK Athletics," UK Sport's chief operating officer Simon Morton said.
"Better balanced boards make better decisions."
The world championships, the flagship event for the embattled International Association of Athletics Federations (IAAF) are being held in London for the first time.
(Reporting by Martyn Herman, editing by Pritha Sarkar)
