You can change a collection to another collection type if you want to present your assets in a different way
1) First select the collection asset you want to change (from the Scene or from the Scene Structure panel) if it is not already selected
2) Click Properties icon at the top right of Composer's panel ribbon;
3) Choose the desired collection by pressing on the "Style" icon located on the Properties panel (screenshot below):
4) The new collection style is now applied...