Ok, so I played around with the CSS
When I set any kind of max-width property on .testimonials-slider .item the individual reviews get cut off at the next theme breakpoint at 1200px.
max-width
.testimonials-slider .item
See here (@1200px) https://cl.ly/1X1M3K0Q0F1K
This is the best I can do without having anything cutoff at a breakpoint of 1370px
https://cl.ly/0b1S3w351z1L
