How to Seller Vacation Setup?
When you want to go to vacation or just want to turn off your store publicly, you can turn on vacation mode by going to your Vendor Dashboard → Settings → Store.
Scroll down until you see Go to Vacation. Mark the check box and type a custom message in the Set Vacation Message text box. What you type here will show up as a notice on top of your public store as long as the Vacation mode is turned on. Click Update Settings button to save changes and turn on vacation mode.

Simply go to Vendor Dashboard >Settings and uncheck Go to Vacation, then click Update Settings. This will turn off the vacation mode.