Add, edit, move, or delete columns in Lists

Move a column

Drag it to its new location.

Add a column

Select   at the right end of the column headers and select the type of data the column will contain.

For technical info about the different column types, see List and library column types and options. Note that this is a SharePoint article and not all of its content applies to Teams.

Edit a column's properties
(including name, type of data,
and whether entry is required)

Select the column header, and then select Column settings > Edit.

Format a column

Select the column header, and then select Column settings > Format this column.

Hide columns

Select any column header, and then select Column settings > Show/hide columns.

Delete a column

Select the column header you  want to delete and select Column settings > Edit > Delete. Delete is at the bottom of the menu.