Class Definitions Panel

The top-left panel of the editor is the schema in action: every class from your Label Schema with its color, its hotkey, and a live count of how many annotations of that class the current task carries.

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Arming a class

Whatever you draw takes the armed class, shown highlighted in the panel. Two ways to arm:

• Click the class row.
• Press its hotkey, the number shown as “Hot: 1”, “Hot: 2” and so on (shortcuts 1 through 5 select labels, per the shortcut reference).

Arming also reclassifies: select an existing annotation with the Select tool and press a different number, and the annotation switches class.

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Reading the panel

• The count on each row is per-task and live; when guidelines say “label every price tag”, this is the scoreboard.
• The ACTIVE chip in the header confirms how many classes the schema exposes here.
• The row menu (the dots on hover) carries per-class actions without a trip back to the schema tab.

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In dense scenes

The counts turn coverage into arithmetic: eight vehicles visible, six on the counter, two to go. Combined with Object Instances’ per-object visibility toggles, working one class at a time through a crowded frame stays tractable: arm, sweep the frame, check the count, next class.

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Next steps