Without being able to see the way it was working before it is hard to say, but when I checked the general page, it seems there is some overflow in the design causing a horizontal scroll with extra whitespace on the page, see here:
If the changes you are looking for are not found in the backups, then you may need to recreate the slider, I am not familiar with that customer created tutorial, so I cannot say how it was working previously or should have been working.
Hi @taghisouf, thanks for the good info. I am having a look as well and am working to reproduce the broken perspective behavior in current chrome version and help to get this reported.
As the creator of the video also has posted on their YouTube channel, there is an issue with chrome 93 + with the perspective reported as a chromium bug, the Webflow team is aware of the problem and the issue already with our team and I expect an update to be forthcoming for this.
I do not have the exact timeline of the update, but I will help to share that here when I know an update has been made.