You can open the preferences window by clicking the settings link in the editor.

OHS-Settings

Automatic String Conversion
This means that the data source converts all strings to NVarChar when SAP is an Unicode system, and to VarChar when SAP is not an Unicode system.

Convert Strings to VarChar
This means that the data source converts all strings to VarChar.

Convert Strings to NVarChar
This means that the data source converts all strings to NVarChar.

Timeout If the value N is set for Execution Mode, Timeout defines the maximum duration for which the component is to wait for a notify from the BW (in seconds).