How to allow enable the weekends as working period in gantt project

You cannot hide the display of Saturday and Sunday in the Gantt chart view. You can show a "5 day" week in the Calendar view.

copied from a Microsoft Knowledge Base article

Method 3: Scale the Entire Project If you want to scale the entire project (not just the timescale portion as in method 1), scale the entire project to fit the number of pages you want. To do this, follow these steps:

1. On the File menu, click Page Setup.
2. Click the Page tab. Choose the scaling option you want to use. Print your project.

NOTE: When you scale your project for printing, the project information is scaled proportionally for height and width.