Our Support team is ready to present you a new tutorial that will show you how to change the slider dimensions in Drupal 7.x.template
Fist, we will need to locate the image style for the slider. Please navigate to Structure > Views > Slider (Content) :
Click onContent: Slider image and see the image style. It is a Flexslider full image in our case:
Navigate to Configuration > Media > Image styles . Find Flexslider full image, click on Edit.
Click on Edit under Operations. Type in new height/width for the slider image and click on Update effect:
Check your website, slider dimensions have changed.
Feel free to check the detailed video tutorial below: