Spread.Services Documentation
Configure Columns to Repeat at Left
Spread.Services Documentation > Developer's Guide > Configure Print Settings via Page Setup > Configure Columns to Repeat at Left

You can configure columns in a worksheet in order to repeat them at the left by using the PrintTitleColumns property of the IPageSetup interface.

C#
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//Set columns to repeat at left
worksheet.PageSetup.PrintTitleColumns = "$D:$G";