The first intention of this commit was to remove ´@extend´ but it actually makes sense to remove ´.oe_left´ and ´.oe_right´ classes. Since grid we can avoid "float" elements (see .oe_subtotal_footer) and we only have to remove this class. For the other case, we have to use ´.float-start' and ´float-end´ to replace ´oe_left´ and ´oe_right´. closes odoo/odoo#139199 Related: odoo/enterprise#49211 Signed-off-by: Pierre Paridans (app) <app@odoo.com>