Hi Elliot, finally I get the data from the array in this way:
if( is_array($checkbox_options)&& in_array( 'show_grid_bp', $checkbox_options ) ) {
echo "border-right:dotted 1px black;";
} else {
echo "border:none;";}
, I still don’t understand very well the docs, could you use the data above and use your code, so I can see?