You can choose to hide system files or generated class files in the Navigator view. (System files are those that have only a file extension but no file name, for example .classpath.)
to open the drop-down menu of display options.
In addition, you can restrict the displayed files to a working set.
Resources
Resource hierarchies
Navigator view
Working sets
Viewing resource properties
Finding a resource quickly
Narrowing the scope of the Navigator view
Sorting resources in the Navigator view