HP Smart Tank 790 All-in-One Scanner is not recognized any more

The screenshots show that HP Smart sees the printer function but Windows is not exposing a scanner endpoint, so the Protected Mode help page is probably incidental. Power off the device, unplug it for 30 seconds, then connect it directly to another USB port with a known-good cable. In Settings, open Bluetooth & devices > Printers & scanners, select the HP device, and check whether Scanner settings appears. If not, remove the device, restart Windows, and add it again; test with Windows Scan before reopening HP Smart. Run the printer/scanner troubleshooter in Get Help and reinstall HP’s full scanning package, not only the print driver. If Windows still cannot discover the scanner, test network scanning or another computer. Failure everywhere points to the device or cable; success elsewhere points to this Windows build or driver, which HP should investigate using the hardware ID.