How to open files as tabs on macOS?

[searene]

I'm using MacOS Sierra, and I heard that opening files as tabs are supported in the os. But how do I do it? When I open a file in Typora, it just opens a new window instead of a tab.

[AlexPasternak]

Asked before, please search for closed issues first. E.g., #979

[searene]

@AlexPasternak It works, thanks!