In the image, there is an A Major over the first measure. Should it be also played over the 2nd, 3rd and 4th measures even though the chord is not written on top? Until the D chord in the 5th measure?
There's no point in repeating the chord symbol if the chord remains the same. Only when it changes is it necessary to indicate the new chord. Which won't have its symbol repeated, but that will continue, bar by bar, until a different chord is needed. Hence the next A, after which it keeps getting played until...the next change. (Which I'm guessing will be E).