Thank you for the feedback.
As I wrote (I called it "user-certificates"), there is under "user credentials" and
"the user tab in trusted credentials" nothing.
That was the reason why I asked my question.
(When I realized that by uninstalling Orbot I could not return the system (in regard to Orbot) to the original state, I was first looking there whether the updated certificates are there)
Since I am an amateur, I don't know if one can possibly find out what happened with the help of "View logs".
(I don't know what and when, is being recorded there and how to read it)