Countdown Time Settings.

First, click on 'Settings' on the left-side menu. Alternatively, in the Dashboard page, navigate to the 'App Setup' section and click on the 'Customize Setting' option. On the right side, you will see the 'Go to Settings' button. Click on it, and it will take you to the Under Construction settings page.

In the 'Countdown Time Settings' section, there are two options available. The first is 'Auto,' and the second is 'Manually.'

Auto: It will work automatically within a 24-hour time frame.

Manually: In this mode, set an end date and time to disable the page.

After selecting the 'Auto' option, you need to set your time period from 'From' to 'To' within a 24-hour timeframe. The page countdown will reset daily. If you want to run the page daily with no end date, you have to set the time from 12:00 AM to 11:59 PM.

After selecting the 'Manually' option, you'll see the 'Select date for countdown.' This is where you can pick the end date of the countdown page, so the page will only be visible until the selected end date. 

Note: Make sure you select a date and time ahead of the current time; otherwise, the page will not be visible in your store

After that, click the 'Save' button, and your changes will be visible in your store.