Show all tabs in Android Studio

For Linux you can do similar to MAC

Not sure if this feature was introduced in later versions of studio (than at the time of which this question was asked) but now you have option to show tabs in multiple rows. You can do so by

Windows -> Editor Tabs -> Tabs placement -> Show Tabs in single  row

You can uncheck above which is checked by default. Snapshot below -

In android Studio 4.0.1 you can find tabs configuration in:

Window->Editor Tabs->Configure Editor Tabs...

After, uncheck "Show tabs in one row" checkbox if it is selected.

The size of the tab bar is fixed and there are only fixed number of tabs that can fit inside that limited area.So, one way to quickly switch between the open tabs is to use the SWITCHER tool of Android Studio.

Press control + tab in MAC (don't know the shortcut for windows) and it will bring all the classes and other files which are currently open and you can efficiently switch between them without even touching your mouse or touchpad.