I have this problem too. Sometimes I have one instance of Files open and I work with some other application like Firefox. Then I click on Files to navigate to the opened instance of Files but this starts a second instance of Files. I can still find the first instance with Alt+Tab.
I have this problem too. Sometimes I have one instance of Files open and I work with some other application like Firefox. Then I click on Files to navigate to the opened instance of Files but this starts a second instance of Files. I can still find the first instance with Alt+Tab.