I'm not sure if this is the right place for this, so please let me know if I should post this to a different group instead.

I have 3 drives on my current PC, but the C: drive is almost full (it keeps bouncing around between 2-1 GB left) and it seems to be slowing some programs down. Most noticeably Audacity stores temporary files in C: while I am working on large files and it often changes wait times on an edit to upwards of 30 seconds (meaning literally nothing happens for 15-45 seconds and then the change takes place, even if it's only a simple few second deletion).

Is there a way to set my D: or E: drive as the default drive of the computer so I can clear out some space on my C: drive and use the extra space I have on those drives? Thanks for any help or information you can give me.

Oddly all off a sudden, while I was watching a video, my phone started to play the same sound as my PC speakers. It was kinda of cool, like my phone was a second speaker. But it did it automatically. Anyone else see this? I have access to YouTube music now so maybe that's a new feature or something?

edit: My device is Windows 10 PC using regular Chrome and Google Pixel XL (Android P)