Categories
You can find the categories panel at the top of the left side-panel. It shows a list of currently existing object categories. The currently selected category is highlighted.
Categories panel
To add a new object-category, type the name of the new category into the Category Name text-field (shortcut: Ctrl+N (Cmd+N on Mac) to focus), optionally choose a color for the category using the color-picker, then press Enter or click the Add button to create the new category. The newly created category will be selected automatically.
Note: Category names are case sensitive and must be unique.
To delete a category, click on the x icon next to the category name.
Note: You cannot delete a category that has bounding boxes assigned to it. Trying to do so will result in an error dialog being shown that displays the number of bounding boxes which are currently assigned to the category.
You can change the name of an existing category by clicking on the category's name and typing the new name and then pressing Enter (note that category names are case sensitive and must be unique). To change the color of a category right click on the category and use the color-picker on the Color menu item.
You can search categories by their name using the Search Category text-field at the top of the categories panel
(shortcut: Ctrl+F (Cmd+F on Mac) to focus). Categories are searched as you type and the first category that starts with the typed sequence of letters will be selected automatically.