Magento 2: How can I check all modules installed using admin panel?

Magento ˆ2.3

System > Web Setup Wizard > Module Manager

Magento 2.2

You can access using the admin panel the route Stores > Configuration > Advanced, as the image below. On that page, you can enable or disable some modules as well.

Notice that this is taken away from the admin panel since Magento 2.2.0. Reference, https://community.magento.com/t5/Magento-2-x-Admin-Configuration/advanced-menu-missing/m-p/81393#M1973

ON 2.3.x : System > Web Setup Wizard > Module Manager

As stated in the replies above, there is no more admin control for Magento2 versions 2.2 and greater. In this instance use this CLI command from your M2 root to output the modules and status php bin/magento module:status.