PhpStorm how to refresh folder content or whole project tree

This may be a dumb question, but I can not find an option to refresh folder content in project tree (PhpStorm IDE). Is this (really basic) feature missing?

I know, that content is refreshed automatically, but in some types of folders, where files are generated and changed often this does not work.

How to open sidebar PhpStorm?

To open the tool window again (and restore the associated features), use the main menu: View | Tool Windows | <Window Name> or press Alt+1 . Hide the tool window. This command opens the description of the Project tool window in the PhpStorm online help.

right click on the folder and then synchronize 'nameOfFolder' to refresh a specific folder