how can i adjust this plugin for 24 hours

The schedule UI function uses a 12-hour format to set a schedule per day, but the operating schedule will function as a 24 hour based upon the time settings set in WordPress general.

If you want the day to be open for 24 hours, set the opening time for 12:00 AM to 11:59 PM. This time format will enable the day to be open for 24 hours.

Best,
Thank you very much for your prompt response
my wordpress is set to the 24-hour time, but this plugin keeps the 12-hour format, where can I change it?

You are welcome.

Let me clarify about the 12-hour and 24-hour support.

On the Schedule tab, under the section Days Schedule for each day, we only support the 12-hour format for the UI creating a schedule. This format to input the schedule times will not change to 24-hour.

But if you have your WordPress set to the 24-hour time, the time format is compatible. For example.

If you set a schedule for 8 AM Opening to 1 PM Closing, when your WordPress site hits 13:00 using the 24-hour format, the closing will occur as the plugin is compatible and understands the 12-hour is 1 PM and 24-hour time format is 13:00.

I hope that additional information helps.