Hello,

yes, it is possible to setup as many columns as you want, it's just a matter of setting the right width in percentages. 24%, for instance will allow you to set 4 columns, plus some space for margins.
BUT it will be bound to the size of the container AND the values you set for min and max width.
So, if the available space is missing, you can get 3, 2 or 1 column instead.

Remember you have 2 different settings for the blog: the leading values and the remaining ones.

You are welcome!