Markdown should have a UI viewer

IIRC You can use the Explorer Preview pane to render basic markdown

Adding to this If you're willing to go third party

Everything can give you instant search, and with a PowerToys plugin you can integrate it into PowerToys Run, which gives you an Alfred Style search bar

WizTree works for visual inspection of Storage

Screenshots apps, Markdown Viewers, are common enough, won't comment further on those

On the printer disconnections: I've had some weird experiences, recently, a technician showed to me that, using the default windows update driver, my work printer regularly disconnected, but using the manufacturers driver, the setup has so far worked without a problem