The style class prefix "col-xs-*" didnt work in cshtml files.

Forgive my poor English, but according to the project and boostrap5 docs, it seems that 'col-xs-' has been replaced by "col-". So the layout in some views are in a mess.

References:

1. https://stackoverflow.com/questions/41794746/col-xs-not-working-in-bootstrap-4
2. Bootstrap5 docs