To apply discount on All Products, use the steps given in the picture.
1.If you want to apply sale on any further date in the given date range, then you can select from date and to date of that all products.
2.If you want to round the price to decimal price, then you can select check box this option to round decimal price.
3.If you want to increase the price to regular price and decrease to regular price, then you can select the price change option.
4.If you want to set the discount price as a fixed amount and percentage, then you can select the change type option.
5.If you want to remove the discount, you can click on the save button by ticking the apply changes this check box, this will remove your discount.