This guide will show you how to filter content when you View New Content.
Click on View New content button near the right top of your screen
you will see on the left a column the last of which is Filter by Forum
Then click on the selection and select the Forums you wish to see New content from and then Save at the bottom of dialogue box.
Once you save the forums you wish to View New Content then you will only receive returns from the Forums you have saved.
This feature only works for members.