You can select any
Individual Record in the
Records Window, or a
Diagram, etc, and then click the
Focus icon in the toolbar near top left.
If your monitor screen is big enough you can even open two instances of
Family Historian side by side and see two
Focus Windows at the same time.
However, it begs the question: How did those "Unrelated" people get into your database?
When adding any
Individual or
Fact it should be supported by a
Citation to a
Source Record as evidence.
Then you can answer questions such as: Why is this person in my database and where did I get the information?
If you think you may have
Individuals duplicated in your data, then there is a Plugin to help you find them:
Find Duplicate Individuals.