Solved at my end
It is not style problem.
Actually we need to edit plugin file - content_slide.php
Value for navigation and links has been written in hardcode format - "false". Take view source of slider in browser, you can view it at yourself. So it doesn't update via plugin admin.
I have updated that area with plugin provided field named as - navigation_next_previous, navigation_buttons.
It has been written at line number 197-198 as :
links : false,
Please udpate file content_slide.php as below :
1. Go at Line 197 and 198
2. Replace New code as below -
[ Moderator Note: Please post code or markup snippets between backticks or use the code button. ]
<?php echo $wpcs_settings["navigation_next_previous"]; ?>,
<?php echo $wpcs_settings["navigation_buttons"]; ?>,