You can delete most columns in a list. When you delete a column, you are also deleting the data in that column. Unlike a deleted item or list, a column and its data cannot be restored. Some columns, such as Title or Name, can't be deleted. You need Contribute permission level or higher to delete a column.
Alternatively, you can keep the column, but hide it from view. For more information, see Edit a column in an Office 365 list: show or hide columns.
Note: Some functionality is introduced gradually to organizations that have opted in to the First Release program. If you're not enrolled in the First Release program, or your administrator has set your view to Classic SharePoint, you may not yet see this feature or it may look different than what is described in the help articles.
Delete a column from a list
Note: Does your screen look different than the examples here? Your administrator may have classic mode set on the list, or you're using an earlier version. If so, see Delete a column from a list or library. If you're a list owner, site owner, or administrator, see Switch the default experience for lists or document libraries from new or classic for the steps to set the default experience.
In the app launcher , click SharePoint, locate and go to the site, and then open the list. If you can’t find the list, click Settings , click Site Contents, and then open the list.
In the Command bar, click View options , and then click Manage views.
If View options is not visible, make sure you are not editing a list or have not selected one or more items. Also, you may not have permission. In that case, contact the Office 365 admin or the site or list owners.
On the List Settings page, in the Columns section, click the name of the column that you want to delete.
At the bottom of the Edit Column page, click Delete.
When prompted to confirm, click OK.