UltraEdit provides for Column Markers that display a vertical line at a specified column.
This menu item works in conjunction with the column markers. When this item is checked (enabled) the columns to the left of the 1st column marker are fixed, and do not scroll horizontally while the columns to the right of the column marker will scroll as normal when the horizontal scroll bar is used or when the cursor is positioned to the right hand side of the window forcing a horizontal scroll.
If this feature is enabled, columns to the right of the marker will scroll horizontally while columns to the left will not. While the horizontal scroll is in effect, any mouse selection or clicking of the primary mouse button within the fixed portion of the display will cause the horizontal scroll position to be reset allowing viewing and editing of the continuous columns.
If the 1st column marker is disabled or set to 0 this function will have no effect.