How should we behave in Galus? Should we try to blend in and keep a low profile?

What did Gedolei Yisrael say about this and how did they behave?
Should Menorah be lit in public? Should a yarmulka be worn at work?
Should we wear black hats, shtreimels and other identifying marks?
Wear talis and tefillin while walking to shul? Build a Succah in a public area?
Should we remove Jewish and Israel references from our resumes when trying to get a job?
What are the biggest religious struggles in the workplace and what is most damaging to a Ben Torah?