Boot Camp Assistant Won't Uninstall Windows

Hi everyone,

I'm running low on space on my MacBook Pro (2020, Intel) and want to remove the Windows partition I installed using Boot Camp, which is taking up 60GB.

I followed the instructions in Apple's support documentation to uninstall windows using bootcamp and launched Boot Camp Assistant. However, after clicking "Continue", I saw this... (See screenshot below)

I'm confused because I definitely have Windows 10 installed via Boot Camp. I'm not sure what to do next. Has anyone encountered this issue before or have any suggestions on how to resolve it?