While creating an Amazon shipment through SellerChamp, you can follow the below steps in order to print your Amazon shipment labels on a 8.5 x 11

Step 1: While still in the SellerChamp Amazon shipment Add Items screen, click on the More Actions button

From the drop down, select Print Item Labels option

This will display the Print Item Labels popup.

Select your page size between 8.5 x 11 and 2-1/4 x 1-1/4 and choose whether to print all items in this manifest on one page or only copies of an item on one page

Once you click the print button, you'll see an option to choose your printer. Select it and you should be done.