Filter For A Single Project/Workspace
From the Task List or Gantt Chart views, mouse over the name of any project or workspace, and click the TOOLS link that pops up, then chose Filter for this project (for a workspace the TOOLS link will instead simple read FILTER). Alternatively, double click inside the cell for a project name, but outside the project name. Projects will show only the selected project (and associated tasks). To remove the filter for the single project, at the top right of the page, click the “X” next to the project name under FILTERS.