Why the left button of slider section disappear？

After installed Elementor Page Builder plugin,the left button in the slider section to change image disappeared .Don’t know why this problem. Have a solution for this Elementor problem ?

• This topic was modified 6 years, 6 months ago by bluevert.
• This topic was modified 6 years, 6 months ago by bluevert.
• This topic was modified 6 years, 6 months ago by bluevert.

The page I need help with: [log in to see the link]