That is it. Change the field type.
URLRoot() & "db/" & [_DBID_PERIPHERALS] &
URLEncode ([Record ID#])&"&dfid=11" & "&z=" & Rurl()
There are also ways to format the rich text formula to open in a new window and show as a button, but it's likely not worth the extra coding if you just simplify the formula and use the Formula URL button.Let me know if this helps 😊👍