When going through the initial setup wizard in the frontend, selecting the database type in the database setup section, only databases whose support modules are detected for the underlying PHP installation are displayed. This causes confusion and is misleading when databases whose support was not detected.

It would be clearer if all supported databases by Zabbix would be listed, but the ones the underlying PHP can't "talk" to would simply be greyed out and not selectable.

This approach should be applied to all drop down lists as this distinctly clarifies whether it's Zabbix that doesn't support something anymore, or simply the environment not having the proper capabilities for it.