Map variables do not appear in field editor or in project settings

Question

I am attempting to utilize a few of the map variables (particularly the new @map_start_time variable associated with the added temporal features in 3.14). I am on version 3.14.1.
I do not see any of the defined "map" variables (seen here) either in the project properties "variables" tab nor in the field calculator.

Does anyone know why this is occurring?

J. Monticolo · Answer

Like in the documentation :

14.3.25. Variables
This group contains dynamic variables related to the application, the project file > and other settings. The availability of variables depends on the context

So to have access to the @map_start_time variable, activate temporal settings for a layer and go in this layer properties (for example symbology tab) and find a data defined dropdown combo (at the right of fields) and go in edit ....

Map variables do not appear in field editor or in project settings

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