Hi,
Sorry for the problems.
There are new options in Theme Options -> Layout Builder -> Builder Options For Developers
Please select the options you like (especially for Custom CSS classes input field) and save theme options.
It is probably caused because we removed theme support avia_template_builder_custom_css – see changelog:
– removed: theme support avia_template_builder_custom_css use theme option or filter avf_alb_get_extended_settings instead
Best regards,
Günter