Scroll bar misbehaves

There has been a change in ‘behaviour’ recently in my version 10.0.3.530. I suspect some setting has been ‘accidentally’ changed. I want to know how to reverse that. When the inbox opens, the scroll thumb is at the bottom of the bar instead of the top; and when I open an email. the scroll thumb moves back to the bottom of the bar.

I see the question is similar to one posted in Nov 2016 but NO solution was offered. On looking at the suggested path, I see that ‘The application is NOT the default’, which surprises me - should I make it the default ? It handles email from Gmail and also from my ISP.

That means you have changed the default from Descending to “Ascending” in the Filter Sort order at the top of the Subject. So just change it back to Descending and close and reopen eM Client.