Hello, @Wade Yang,
1- In order to solve your issue simply go to the Dashboard >> XStore >> Theme Options >> Theme Custom CSS >> Global and paste the below code at the bottom of the CSS box there.
.category-grid .categories-mask h4{display:none !important;}
Then save settings and check back to your site after clearing the browser cache. The result will appear like this: https://postimg.cc/K4jMmJnN
2- From the category widget slider settings you can change the columns as I showed you in this image: https://postimg.cc/BLdwQtwc
Regards 8Themes Team.