When you edit a cell in a single select field, you will be presented with an autocomplete menu. You can select the desired option from the dropdown menu, or click the following article to narrow down the list of options.
You can add, remove, and edit select options in the field customization menu. You can also reorder the select options from within the field configuration menu by clicking and dragging on the reorder icons, which appear when you mouse over the left-hand side of each select option.
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