In WordPress Dashboard go to Appearance submenu and click on Customize.
After clicking on customize you will in theme Customizer.
Here you have to click on Home Page Section.
Now In Click Slider Section Here you Manage Content of Slider
Go to Customize ->Home Page Section->Slider
1.Hide /Show Slider
In WordPress Dashboard go to Appearance submenu and click on Customize.
After clicking on customize you will in theme Customizer.
Here you have to click on Frontpage .
In Slider Section Here you Manage Slider Opacity.
Go to Customize -> Frontpage Section -> Slider Section
You have to use Slider Image Size 1920Px X 1020Px