Trying to set up an email account on outlook provided from o365 subscription

As i want to only download emails from past 15 days. i dont need the emails prior to than on this outlook . it ok if they remail on the server I tried to follow the below steps

File account settings -> account settings From the "account settings" window select the email account Click Change

Under Offline settings move the slider to the far right till it reads "all" Click Next Restart outlook

But i am not able to find the offline settings, I using Windows 10 with Outlook provided by my O365 subscription.

Can anyone help.

regards, Dinu