feel at home
to feel relaxed in a place or with a person

[TahlilGaran] Dictionary of Contemporary English ▲

relaxed feeling calm, comfortable, and not worried or annoyed:
I was feeling relaxed after my holiday.
Looking relaxed and confident, the president answered questions from the press.
He seems very relaxed about the whole situation.
easy-going relaxed and not getting annoyed or angry with people – used when this is a part of someone’s character. An easy-going person likes to have good friendly relationships with other people, and is not strict about rules:
Fred MacMurray was very easy-going and a pleasure to work with.
The hotel owner was an easy-going woman who let visitors come and go pretty well when they pleased.
The children were brought up in an easy-going atmosphere at home.
laid-back informal relaxed and not getting worried or annoyed about things – used when this is part of someone’s character. A laid-back person likes to take life slowly:
He seemed like a cool laid-back kind of a guy.
Life on the farm was more laid-back compared to life in the big city.
comfortable feeling happy and not worried about doing something, talking about something, or being with someone:
The teachers were comfortable with the new technology and the students loved it.
Some female patients are not comfortable with the idea of seeing a male doctor.
This is an emotional issue, which most people aren’t comfortable talking about.
at ease [not before noun] feeling relaxed in a situation – used especially when someone feels less worried than before, or when many other people would not feel relaxed in that situation:
After a few weeks at college, I started to feel more at ease.
He looked completely at ease on a horse.
He was surprised to find himself so at ease with her father.
feel at home to feel relaxed in a place or with a person:
I’ve always felt at home in Tokyo.
He felt instantly at home with her.

[TahlilGaran] English Thesaurus ▲

feel at home
• (feel) at home
to feel comfortable and relaxed; to feel accepted, to feel as if you are at home
I was able to make myself at home while waiting for my friend.

The woman always makes her guests feel at home.

[TahlilGaran] English Idioms Dictionary ▲