Unlike other themes, the Namaste! LMS Theme does not force you to use a specific slider. Any responsive slider will do the work. If you don’t have any favorites, have a look at Master Slider – Responsive Touch Slider, Slider by Supsystic or Smart Slider.
You can show any slider in the homepage. Place its shortcode in the field Namaste Theme Panel – Style Options – Shortcode of your favorite slider.
To remove the slider without deleting any slides or deactivating the plugin you need to simply delete the shortcode from the field.
If you have deactivated the slider plugin you absolutely must remove the shortcode from the field.
If you don’t want to use a slider you can set a static Header image. Go to Appearance -> Customize and chose Header image.
To use the static header image your Shortcode of your favorite slider in Style Options must be empty!