Microsoft Print to PDF missing from printer list

It's a Windows feature that can get switched off. Press Win + R, type optionalfeatures and hit enter, find Microsoft Print to PDF in the list, untick it, OK, then go back in and tick it again. That reinstalls it. If it still doesn't show, add it by hand: Printers & scanners > Add device > The printer that I want isn't listed > Add a local printer with manual settings, use the port called FILE:, then pick Microsoft from the left column and Microsoft Print To PDF on the right.