remove non-standard search options from Safari options

For some reason (not sure when/why this shows up) I have in the search ton (Lupe) "Ecosia".

I doing want it there...

I went to Safari/Preferences and then Search Tab... and it is in the drop down menu... but I can't find a way to delete it.... (see picture)

It is not part of the default so should be possible to reset it....

Note: I do not have ecosia as installed as extension (checked in the Extensions Tab in Safari), nor it is installed as App in my system

Any Hint please on how to remove/reset it?

thanks