make yourself at home
(idiomatic) An invitation to a guest in the speaker's home to treat the house as if it were theirs.
Come make yourself at home and enjoy our breath-taking scenery and decor which brings together modern Caribbean tranquility with a new age feel. Source: Internet
There is an exposed kitchen in the back, and the private dining room has space for 16, with bold artwork, more globe lights, and a record player, so make yourself at home. Source: Internet