Yes I know that. I wanted to mark ALL forums read from the main index page! as we had before.How To Mark Forums Read
If you want to mark a specific forum as read, navigate to that forum. At the top you will see a button to “Mark All Read.
If you want to mark all threads in the community as read, click on NEW near the upper right-hand corners of the site.
Click on Mark All Read.
You will then see a popup confirming that this is what you want to do. Click “Mark All Read”.