How to enable styles and markup styles in richtext field in List Sharepoint

To fix this problem you will have to change your field in the schema.xml like this
<Field ID="{XXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXX}"
Name="RichtextMenuEnabled"
DisplayName=" RichtextMenuEnabled "
Type="HTML"
         RichText="TRUE"
         RichTextMode="ThemeHtml" />

Or
Try this
Create your column with data type as: Full HTML content with formatting and constraints for publishing
Site Column
Create
Enter Name: MyColumn
Select  type as: "Full HTML content with formatting and constraints for publishing "
Ok
Now go to list, add "MyColumn", now insert one table, inside "MyColumn". Click on table, You will get Design tab in the ribbon.
You will see "Styles" option.