Hide the no content helper picture / photo / banner in sale order module or other modules
/odoo/lib/odoo-18.0.post20241005-py3.12.egg/odoo/addons/web/static/src/views/view.scss
To it in sale module, put the following code in the end of line
.o_sale_order .o_nocontent_help a.btn.btn-secondary {
display: none;
}
.o_sale_order .o_nocontent_help a.o_sale_action_preview .img.img.w-100 {
display: none;
}