This screen is optional and normally you can simply click Next to proceed.
The screen gives you the option of changing the number of characters in any text fields that are being created. Text fields in a geodatabase can take up excess space if they are set too large, so it is good practice to keep them as small as possible while still supporting the text values you need. By default, Scenario 360 sets the text fields in the internal table to be exactly the same size as the longest value currently existing in the external table. If you anticipate that the external table may take on longer values (more characters of text), enter a larger number for the “Length” of the appropriate field. If the external table takes on a text value that is longer than the length you have specified, its values will be truncated (cut off on the right) when they are brought into the analysis table.