Need your advice, please.

Need your advice, please. I work for the town (local Gov.) for more than 1 year as a part-time employee. Since May 2021, I have been working more than 7hrs per day because they have a short staff, always as a part-time employee.

Now the office has 2 new additional employees, which they can move out due to legal reasons. Consequently, they are asking me to return to 5 hrs of work per day which I am fine but my only request was to be placed on the morning shift, which was denied.

Do I have an "other" option to request the morning shift? or any right to request?

Thanks!