The oven is versatile. You can use any of the features individually (microwave, convection, grill) OR you can use them in various combinations! This feature increases your cooking flexibility greatly. It is important to find the feature "numbers" in the book to know which buttons to push to get which "combi"/joint features. Some have their own buttons, while others require a choice within a different main option. (I wrote down the ones I use the most and keep them by the machine until I memorize them.)
But YES! You can have convection only!