Shopware allows to add new products within existing orders. How ever, the way the button is currently designed is quite counter intuitiv and causes confusion.

The button consists of two parts: "Add product" and an area with an arrow, indicating further options. Users tend to interprate it as in they need to click on the arrow area in order to access all options to add a new product. How ever, there are only the option "Add custom item" or "Add credit".

This could be prevented by simply also showing the "Add product" option here as well.