Is there an analogue of approaching an object in Marmoset? For example, in Blender you need to press "del"
Yes, there is an analogue of approaching an object in Marmoset. You can use the scroll wheel or the "+" and "-" keys to zoom in and out on an object.
Ctrl-F to focus on an object in Marmoset.
Works similar to F key in Unity or Z in 3dsMax.