Hello,

Thanks for reaching out to us. Unfortunatelly, currently, there is no option to increase the overall width and height unless you edit it with the CSS code. However, for the text width, you can use this CSS code 

.am-adv-select__popper .am-adv-select__item {
  flex-wrap: wrap;
}
.am-adv-select__popper .am-adv-select__item-label {
  width: 300%;
}
.am-adv-select__popper .am-adv-select__item .am-adv-select__item-label {
    white-space: break-spaces;
    text-overflow: unset;
    overflow: unset;
}

It would look like this 

Custom code needs to be applied to the page where the booking form is. Depending on what you're using (Gutenberg blocks, or some page builder), adding the CSS or JS can be done in a few different ways. 

If you need help with adding custom CSS to the page, please take a look at this article.

Thanks for the confirmation.

I will forward the information to management / developers, you can also suggest it as a feature on our feature suggestion page.