If you'd like to close your store during a time you would normally be open (such as for holidays or special events) you can do so by creating an Hours Exception
When creating an Hours Exception - be sure you input the time you will be closed. So if your store is normally open between 8am - 8pm , but you'd like to close at 2pm. You would create an Hours Exception for 2pm - 8pm.
Hours Exceptions will not work for closing your store same-day. To close your store to online orders immediately you can use the Temporarily Disable Online Ordering option from you POS Settings