To do this use Shift+left-click, Ctlr+left-click , or Ctrl+a to highlight all rows you would like to label at the same time. Then right-click on one of the highlight rows in the Labels column and select Edit Selected Row(s). See figure below.
This approach can be applied for other user editable fields (like Comment for example) in Byos Peptide and other Byos workflows.
NOTE: For the Validate column, we support hotkeys to make this process more efficient (t=True-Positive, f=False-Positive, u=Uncertain, and e=blank), negating the need to select Edit Selected Row(s).