Is there a setting in my DELL laptop that I need to activate that shows forum posts as read?

I've had a desktops and then laptops for years. I've been on DU since almost the beginning. Always when I would read a post it would turn from Blue to a light purple color which indicated that post was read.

I got a new DELL laptop earlier this year and I hate it. They changed so many things since the last one I had. One of the functions seems to be recording forum posts as read. It's not just DU, but a couple of other forums I follow. It's frustrating. I'll check the forums in the morning and read the posts. They change color indicating they've been read. I just open DU and every single post I read this morning shows as unread, not only the ones from this morning, but as I open all the pages of past posts, every single post from days ago show as unread.

Is there a function in Setting that I need to activate so that when a post records as read, it stays in that mode?

Not a big deal, just very frustrating to open up a forum and all the posts show as new when they've been read.

Thanks for your help, much appreciated.