Use the ownership tabs to filter your Activities list by ownership, you can select to view activities (including practice sets, formatives of various types, and quick links) owned by you, or activities that are owned by others and were shared with you:

User the types dropdown menu to filter the list down by the type of activity, you can select to view one activity type only out of the dropdown menu, or to view all types.

Use the "Filters" dropdown menu to reveal additional filters as seen below. The dropdown will open as a right-side panel

Filter to only your assigned activities or only your unassigned activities:

Filter by years tagged to the activities:

Filter by grade levels tagged to the activities:

Filter by the subjects tagged to activities:

Filter by the formative type tagged to the activity:

Filter to view only activities tagged as Common Assessments (School & District license feature)

On your "Activities" page use the sorting drop down menu:

Type keywords into the search bar to locate activities by title. Clicking on the title will redirect you to the Editor's page of the activity: