From time to time I need to open multiple files in PyCharm. Every opened file has a visible tab on the top of the editor. From my observations when the visible tabs take the space of two rows PyCharm starts to automatically close the files opened first. How can I prevent this? Often I really need to open the files that PyCharm automatically closes and my productivity drops immediately!
Windows: Settings | Editor | General | Editor Tabs | Tab limit
Mac: Preferences | Editor | General | Editor Tabs | Tab limit
Under the Tab Closing Policy group, the default is 10, set it to some larger value.