Prevent search term sharing between MacOS apps

Thank you for adding this!

Although I must be quite dense because I can never seem to get hidden prefs working for me.

I installed 3.9.5, then quit DEVONthink and from terminal ran :

defaults write com.devontechnologies.think3 DontSetFindPboard -bool TRUE

verified it got set :

defaults read com.devontechnologies.think3 DontSetFindPboard
1

then load DEVONthink, search window pane open
go to a browser and search a word (for example “Powerball”)
got to DEVONthink
and “Powerball” is in my search query

Did I miss a step?