Enable sidebar on a Mobile phone

Hi Noda,

Happy New Year!
I would like your assistance with the following please:

1. The sidebar menu of my blog which contains the search option and sign up/newsletter form does not show on any mobile phone. Kindly direct me as to how to enable this to show on mobile phones.

2. I set up the Testimonial page and used WP Bakery Builder to make design changes – huge mistake as it comes up with an error message any time I try to save it. Is there a way to go back and use the default Testimonial settings? I only require a one column standard testimonial box

3. I added a youtube video link to the post format settings under Essential Grid in a post. I published it and it only shows up as the excerpt of the front of the post but if you click further into the post, it doesn’t show. Will be grateful for your assistance here too.

Many thanks