Howdy,

By default Text is stored as varchar(100) in SmartBox and Memo is stored as varchar(max). You can change the field length for text by selecting advanced mode, click on the field and click on SmartBox settings. You can not change the field length for Memo. This obviously only applies if the fields are stored in smart box, otherwise it will depend on whatever service object and data stores you have behind it all.

Cheers,