Docs | Create drop-down lists in Sheets
Select a cell in a sheet, and click the drop-down list pane in the toolbar to edit the drop-down list of the cell. After you've made the modification, check Apply to exact same drop-down lists at the bottom of the pane, and all the same lists in the sheet will be selected. Click Confirm in the lower-right corner of the pane, and the same drop-down lists in the current sheet will be updated as well.
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