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I do not have copy of Customizr theme in my localhost, so I can not duplicate same problem, here is my suggestions:
1) You will need check if the built-in sliders of Customizr theme is responsive, for example, deactivate Layouts plugin, test the problem sliders in front-end.
2) If it is not responsive, you can ask help from the theme author of Customizr theme, check if is there way to make a responsive sliders
3) Or you can create a sliders with Views plugin, see our document:
Creating sliders with Views https://toolset.com/documentation/user-guides/creating-sliders-with-types-and-views/