Uninstall distribution?

I installed Linux Mint and Ubuntu 19.04 on my laptop (and Windows). Now I would like to remove Linux Mint and the associated partition. Just have no idea how to do that, because I actually always formatted the partition when installing a new OS.

You already answered it. Format the partition.

If you would simply recommend doing it in Windows, you don't need to do it via the terminal. Simply enter partition in the Windows search bar. Then you will find the program.

Just have to make sure that you format the correct partition.