One prewar design change for each major European navy

What single 1914-era change would you make for each major European naval combatant?

He would accelerate each navy's strongest plausible direction, led by British 15-inch-gun dreadnoughts and German fast battleships.

For Britain, Orion and later ships receive 15-inch guns, potentially ending the Anglo-German race through industrial overmatch. Early service use could also expose shell-testing problems and make 18-inch guns plausible by the Queen Elizabeth generation. Germany receives a Blucher interpreted as a fast dreadnought, France gets new design leadership, Italy accelerates the Francesco Caracciolo class, and Austria-Hungary begins the Ersatz Monarchs sooner. The answer favors changes that redirect existing institutions rather than importing technology from the future.