Where can I change the default row height for the theme/ WP Bakery?
Where/how can I change the maximum upload file size?
The height of visual row is belong to your page content. Also in order to increase the max upload file size, you need contact hosting provider to help you do it.
No, when "full row height" is selected, it uses a default row height setting, that is set by the theme. I can't find where that setting is in the theme customize options or in WP Bakery. When "full row height" is NOT checked, then yes, as you say, it is dictated by the content size. Please investigate and let me know where that setting is in the theme or WPBakery settings please? I can't find it anywhere.
Max upload file size can be dictated by php.ini settings, by the Wordpress config.php and the theme.
I do not clear your wishes about row height.
You can build the page content and check on the full height option if you want that row section to be full height.
If not, the height of row will be set by content height.
There are does not have any default row height.
Okay, let's close this ticket.