Widget Editor page (id=widget_editor) is blank if 'Bootstrap alternative' is marked false.Issue Widget Editor page (id=widget_editor) is loading blank (/sp_config?id=widget_editor) after upgrade.ReleaseALLCauseIf 'bootstrap_alt' is checked on a container, we will not apply the 'sp_container.width' choice list value (which is either "container" or "container-fluid") to the container's CSS classes on the page, we won't apply the "row" class to the row, and we won't apply the Bootstrap column size classes. These are defined by 4 fields on the sp_column record: size_xs, size_sm, size, size_lg. So if the field is checked, the admin is responsible for providing any needed CSS classes (and corresponding CSS) for the sp_container, sp_row and sp_column records to render the container how you want it to look. There are only two out-of-box pages with containers where bootstrap_alt is true: the widget editor page, and the list/form page (id=lf). The bootstrap_alt field was created specifically for those two use cases.Resolution1. Go to the page(widget_editor)in sp_page table. 2. Mark Bootstrap alternative to true.3. Save the changes.4. Try to reproduce the issue. The issue must now be resolved.