Why will the blue dot not disappear after reading an email?

[iMore Question]

Once I read an email, the blue dot indicating the email has not been read, does not disappear and it stays.

 

[Just_Me_D]

Pull down to refresh or give it some time to disappear.

 

[maggiewa]

Re: Why will the blue dot not disappear after reading an i

Why will the blue dot remain on email?

 

[maggiewa]

Pull down what on my MacBook Pro?