Have a ThinkPad E490s. It's nice. Upgraded the RAM immediately. Upgraded the SSD this past weekend from 256 gigs to 1 TB.
Bad news after restoring my laptop's image: There was this weird recovery partition sitting between my old files and my free space and Disk Management wouldn't let me remove it. I was stuck, it appeared, with a D: drive, which, in my limited experience, is never a good thing to have on the same physical drive as C:. It sounds like it shouldn't be bad news, and might even be a good way to separate concerns, but I've never caught myself thinking, "Gosh, I'm glad I did that," and have, on several occasions, though, "WHY IS IT EASIER IF I KEEP EVERYTHING ON THE C:\ DRIVE? WHY DOES THAT STILL MATTER IN THE 21st CENTURY?!!?1!/!!!?"
Anyhow, cut to the chase: You can delete the Recovery drive from your disk, and do it without fear if you have an imaged backup and a USB recovery/startup drive already in your possession like I did before removing the old drive.
TL;DR -- diskpart, list disk, select disk, list partition, select partition n, delete partition override.
You can now expand C: into that extra space.