The Filter tool is used to control what is visible in the drawing area.
Use the + icons to expand or the – icon to collapse the groups.
Visibility can be toggled for each category and subcategory by using the eye icons. All icons start grayed out to indicate that everything is in a non-filtered state. Click the eye icon () to show a category; click the second icon () to hide a category.
Keep in mind that a main category always takes precedence over any of its subgroups, and that the tree view is read from top to bottom. This means that objects that belong to more than one category will follow the last read category. On a top group level, Hide is dominant, while Show is dominant within the groups.