On the Columns tab of your table property sheet window, you can change your table structure. 
Before doing so, please close your table's Grid View as changing the structure and/or column names will invalidate the data, filtering and ordering of columns. In the Field column, you can change your column's name or supply a new name for a column. MySQL field types/column types can be set in the Type column. The Allow Null column determines if null values is accepted as being valid in the specific column, the default column you can use to specify a default value for your column. In the Editor column you can force your Grid View to use a specific type of editor for this column, for example you might prefer a memo editor instead of a normal string editor for a varchar column, or maybe prefers a track bar or spin editor for your integer columns. The Options column contains miscellaneous options for your column, ex. if the column is considered to be a Card caption column for your Card View or if you prefer to view the column contents in a Preview pane per record in your Grid View. 
Neither Caption columns nor Preview columns can be edited in your data Grid View. Also note that if you have no Caption column for your Card View, you will not be able to expand or collapse your cards.