How Do I Assign a Value to Multiple Features at the Same Time?

From JMARS Wiki

In the "Features" section of the Shape Layer focus panel, users can edit a particular field for multiple rows simultaneously by:

1. Highlight the rows you want to edit.
2. Right-click on the column you want to edit for the selected rows.
3. Select "Edit Column of Selected Row"
4. Enter either a value or text in the pop-up input window and click "Ok"
5. All of the highlighted rows will reflect the change in the selected column.