Sometimes there is a need of closing your online store, so people can’t check out. There are two ways to temporary close your ZenCart store.
The fist solution is to use “Down for maintenance page”. Simply you log in to your control panel and select Configuration > Website Maintenance > Down for Maintenance. You can turn on here Down for maintenance page.
Alternatively, you can set your store to showcase mode. To do so you go to your admin panel then Configuration > My Store > Store Status and choose 1 or 2 depending upon whether you want visitors be able to see your store with process or not, either way they will be unable to make purchases.