Just after installation you will see the password protected maintenance page:
To disable it, perform the following steps.
Open your site admin panel and navigate to the Online Store > Preferences > Storefront password section.
Uncheck the option.
Save the changes and refresh the site.
Feel free to check the detailed video tutorial below:Shopify. How to make the site visible after installation
Also, take a look at the selection of premium Shopify themes to choose the perfect items for your online project.