I don't scan documents to turn them into PDFs anywhere as often as I once did, but when I do need to do this, I always turn to Microsoft Lens.
And it's not just documents I scan with it. It's great for scanning posters, protected slides, and pretty much anything else you might want to change into a PDF.
There are lots of apps that promise to turn documents into PDFs, but this one is by far the best, easiest to use, and most reliable.
And for those who use other Microsoft apps, this integrates well into the ecosystem.