In Brazil POS it is possible to create products that can be related with other products. Generally, when the user selects a product with a related product attached, a window with a list of related products that can be sold with the previously added product to the shopping cart will appear. This, however, can be disabled.

If this setting is enabled, the user can find the related products by clicking on the product in the cart and choosing the puzzle button in the top right of the card.

To do that, please navigate to POS Settings -> Configuration -> General -> Disable Opening Related/Substitute Product View. 

Default View:	With "Disable opening product view from product search” Enabled: