The option to enable Self Defined Project Duration should be in the "Control de caracteristics" menu in the toolbar at the top of your screenshot. Do you see it there? If not, what version are you on?
I agree with Erica that the self project duration can help you, however, you may experience issues since you are fixating the days of the month to 20 (example)
You can also try to use the Project Calendar control feature with which you can directly see which calendar is being used for project scheduling. The first step would be to open the project and click on the Calendar tab, there you will see the working days for that specific project. If the work hours are not aligned to what you want, try to change the template using the Calendar action which is placed right next to the Project Budget. Here click Change template and select the one you want to use. After you perform these actions click again on the Calendar action and click Sync. With this function, the Tasks should get synced to the new calendar.
Thank you by your response. But, I can't find the point that you have referenced: "Settings>Parameter, you can enable "Self Defined Project Duration" under Feature Control"
Look next sreenshots althought my language is in spanish when I try to find:
In my configuration can't find it... look:
Can you tell me in what part I cand find the functionallity than you referenced?
I think there is a new feature to help with this issue. If you go to Settings>Parameter, you can enable "Self Defined Project Duration" under Feature Control. It places a section on the Project like this -
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