Dear uththamag,
Imagine you have a field to select layout like so:
array(
'name' => __( 'Layout', 'rwmb' ),
'id' => 'layout',
'type' => 'select',
'columns' => 12,
'options' => array(
'one' => '1 Col',
'two' => '2 Cols',
'three' => '3 Cols'
)
),
To toggle a field with selected value, just add:
'visible' => ['layout', 'SELECTED_VALUE'],
SELECTED_VALUE can be one
, two
, or three
like the above example.