Min-Divider-Location
This property sets or retrieve the leftmost or topmost position of the divider bar in the Split-Pane. The value is expressed in percentage where 0 is the leftmost or topmost position and 100 is the rightmost or bottommost position. The default value is 0.
 
Example - Define a split-pane that whose divider bar can’t be moved to the left.
screen section.
...
  03 screen-1-sp-1 Split-pane
     line 8.0
     column 5.0
     color 7
     size 45.0 cells 
     min-divider-location 50 
     .