After you’ve created new columns for your list or library
in SharePoint 2013, you might change your mind about the column name or
data type. You might want to require that information is entered in a
field or include a different default value. You can also delete columns
that are no longer necessary.
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On the List tab, in the Settings group, click List Settings.
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On the List Settings page, in the Columns section, click a column title.
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Make the desired Column changes and click OK.
Caution
If you change your mind about the Type for a column, you’ll find
that not all Types are available when you go back to edit it. In this
case, your only alternative is to delete the column and create a new
one with the correct Type.
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On the List tab, in the Settings group, click List Settings.
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On the List Settings page, in the Columns section, click a column title.
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Click Delete.
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In the pop-up message box asking you to confirm the deletion, click OK.
Tip
The Title column included in SharePoint lists is a required column,
it cannot be deleted. If the Delete button is not displayed in the
settings for the column, this indicates that the column is a required
column in this list.
Caution
Deleting a column also deletes the data in that column.
Before deleting a column, consider exporting the list to Microsoft
Excel to back up the information. This can be done by clicking Export
To Excel in the Connect & Export group of the List’s ribbon.
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