Courtesy of a tip from the infamous Dan Diebolt, it turns out it's stupid simple.
Make an anchor tag as a text formula field with HTML enabled and put it near where you want to position to after the button does its thing
"<a name=PTdemo></a>"
Then just suffix your last rdr with # and the tag name. The tag name is case sensitive and while I have not tested, I avoid any spaces or special characters.
You may have to play a bit in the placement of the anchor tag. When you get it placed right, then just edit the form properties to hide the anchor tag field name so the field will be invisible
Here is an example of the last part of a URL formula button. It will display the record and jump to the PTdemo anchor tag.
h t t p s://xxxxxxx.quickbase.com/db/xxxxxxxqb?a=dr&rid=17#PTdemo
