Selecting
Click a row to move the cursor. Shift-click or drag selects a range, Ctrl-click toggles one paper. ↑ ↓ (or J K) move, with Shift to extend. Space toggles the cursor paper in the selection. Esc clears it.
Labelling
I IN, O OUT, U unsure, X clear. With nothing selected they act on the cursor paper and move down one.
A labels every unlabelled paper above the cursor IN; B labels every unlabelled paper below it OUT. These are stored as assumed labels (dashed pill), separately from papers you looked at, and the accuracy figures can be shown with or without them.
Ctrl Z undoes the last labelling action, however large.
What the numbers mean
The score is the extractor's own: each keyword mention counts once, multiplied by the weight of the section it sits in, and only if a shark or ray term appears within one sentence either side (when the proximity filter is on). A paper is IN when the score reaches the threshold and, if the rule has anchors, at least one anchor word occurs.