By default during installation Linux Mint will make one root partition and one swap partition. If you are looking to create separate partitions (which would be best), then you would need to create the partitions manually.
Recommended Linux Mint Partitions
By default during installation, Linux Mint creates a root partition and a swap partition for you. If you would like more control and create additional partitions such as a /home partition, you will have to use manual partitioning. One benefit of having a separate /home partition is when you re-install Linux Mint, you won’t lose the contents of your /home.