This sample demonstrates the Spreadsheet freeze pane feature by applying frozen rows and columns with the Gross Salary scenario as an example. In this sample, you can see the frozen rows/columns that are visible while scrolling the sheet content vertically/horizontally.
Freeze Panes helps you to keep particular rows or columns visible when scrolling the sheet content in the spreadsheet. You can specify the number of frozen rows and columns using frozenRows and frozenColumns properties inside the Sheet property.
In this sample, the first 2 rows and columns are frozen using the frozenRows and frozenColumns properties.
More information about the freeze panes feature can be found in this documentation section.