How to Remove Proxy? Need Help Disabling Proxy Settings! or Stuck with Proxy Settings – How to Remove

For a full how to remove proxy cleanup, don’t forget the Group Policy Editor (if you’re on Pro/Enterprise).

Hit Win + R, type `gpedit.msc`, then go to:
Computer Config > Admin Templates > Windows Components > Internet Explorer > Make proxy settings per-machine.

Disable or set to "Not Configured." Reboot after.

Also, check for any sketchy browser extensions—they can force proxies too.