A family of Microsoft relational database management systems designed for ease of use.
Hi S.A.,
Highlight filters leave all tasks visible and just apply a highlight to those tasks that meet the filter criteria -- for example, critical tasks. On the view tab in the data group are choices for Highlight and Filters. A filter applied hides all tasks that do not meet the criteria. So, for example, if you selected Critical - only tasks on the critical path would appear.
As Jan notes, it sounds like you are using Autofilters - you will want to deselect the "All" choice and only select those key tasks that you wish to show.
I hope this helps.
Julie