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A quick post to try making clarification about a topic that I see every day is quite confusing.
Microsoft Dynamics 365 Business Central is not yet exposing all the controls that you’re used to have from Microsoft Dynamics NAV pages. These fields are not missing on the database tables and this is not a bug from Microsoft.
In D365BC, many controls on pages are tagged with the #Advanced application area, which is currently not assigned to any experience:
If you want, you can assign the #Advanced application area to an experience by using an extension, but be careful: in this case you will loose any simplifications made for the standard Dynamics 365 Business Central version (you could see more actions and fields on a standard page).
To enable the #Advanced application area, you can create an extension for D365BC where you subscribe the OnGetEssentialExperienceAppAreas or the OnGetPremiumExperienceAppAreasevents. If you have defined your own experience you must subscribe to OnSetExperienceTier.
The experiences are additive so you only need to subscribe to one of the events. For example, to enable Essentials and Premium experiences you only need to subscribe to OnGetEssentialExperienceAppAreas.
Most of the #Advanced controls will be exposed in a coming update, probably Summer 2018.