print composer - Using atlas in QGIS?

Running on Mac OS.

I am using a composer template that I have used in the past with this version of QGIS (3.2) that uses an atlas. Now it does not display the Atlas tab in the composer. The generate atlas box is checked.

I then installed 3.4 with the same result. Next I tried opening an empty composer and loaded a map, still no Atlas tab and checking the generate atlas box had no effect (it did not register -- no tick -- it appears disabled).

I swapped to a near identical system and started QGIS 3.2 opening the same project (it is stored on Google Drive) using the same PostGIS database with the same result.

Anyone have any idea what is going on? I last used this print template a few months ago.

Answer

The Atlas setting are hidden by default.

From the Atlas menu at the top choose Atlas Settings, the tab will then appear.