Calendar - NEED IT TO BE 7 WORK DAY WEEKS

First of all please have a look at the attached Excel file. This is an Employee Leave Tracker.
The template only has 5 working days in it, but I need to set 7 working days (Saturday & Sunday are also working day). Wondering, how to get this working without spoiling the functions. I am very newbie to Excel, tried a lot by google search, But no luck.

Hi,

in F4:

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