Hi,
Here is the solution to the first issue.
Please put the following code in your custom CSS:
.sppb-addon-thumb-gallery .flex-direction-nav li.flex-nav-next a:before, .sppb-addon-thumb-gallery .flex-direction-nav li.flex-nav-prev a:before {
font-family: 'Font Awesome 5 Free'!important;
font-weight: 600!important;
}
Hope this will solve the issue for you.
I need time to look into the other issue. Please allow me!
Note: Path towards custom CSS:
Extensions>Templates>Styles>
Click on your current default template name then choose Template Options.
Then find custom CSS within the custom code.
https://prnt.sc/pu705g
https://prnt.sc/pu70zn
Best Regards