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I cannot find a button to switch the “from” and “to” units.

IMO, any converter needs one, so add it or make it easier to find.

You will see the link just before the share buttons to switch conversion.

Still don’t see it (iOS, both iPhone and iPad).

I see 5 circular buttons: Facebook, LinkedIn, Twitter, WhatsApp, and a “Copy url to clipboard” one.

Just select any two units... the yellow color text will popup as shown in the image.