oki have a little more time. This is what my laptop partitions .look like - its a lean machine running Slackware. The key points are probably initially it only had Windows 10 , it has uefi firmware and I wiped it to put Slackware on.
Since i came back i see you deleted Windows. The winre_drv and associated are windows recovery partitions so unless you want to put windows back maybe immaterial now .
Depending on how long you have been running Mint and what stuff you have on it , i would be tempted to delete /dev/sda2 onwards and re-install Mint cinamon . Then using gparted put as /dev/sda2 say a 3 gig swap (of file type swap) then that would leave /dev/sda3 /dev/sda4 for maybe root and home of circa 40-50 gig leaving plenty for root.
So what LorenDB was saying is that if you have Mint cinamon booted up it means it will have fiel system mounted and to use gparted all partitions must be un-mounted. If you use gParted from the live Mint OS then the hard drive will be unmounted so then you can work on it from the usb live OS.
I suspect you may have gone a bit futher prior to this post let us know how you get on