So, it becomes a harder task to find which file is located where.
While developing an Android application, we make many files and in those files, there are many classes and symbols. To close or hide all the opened tool window and to get the maximum space available for the editor, you can use ctrl + shift + f12. To get back the window again, you can press f12 anytime. You can close the recently opened tool window by pressing the shift + esc (For both Windows and Mac)button. So, now you can press G to open the Gradle(the switcher is open here). Here, you can see that G is underlined in case of Gradle. For the color of the text, go to Android Studio > Preferences > Editor and then change the desired property according to you.
Being an Android Developer, we use a number of IDE for writing the code for our Application.