Hello @Prof_Techno,
Thanks for the test and the feedback! I checked with your code P0209: it is indeed valid, your cinema currently has around 15 films on display per day — everything is working fine on the data side.
Some point-by-point answers:
Missing films (« 12 out of 26 ») : the widget grid is capped at 12 thumbnails — this is a limit of the core Gladys component, not a bug in the integration, and only one grid per widget is allowed. I just published a new version that adds, below the grid, a line « +N films not displayed: … » which names the films beyond 12: click on « Force update » on the integration page to get it. To really go beyond 12 (true pagination), it requires an evolution of the core: I opened a dedicated request here 
Widgets de dashboard — accéder aux éléments au-delà du plafond de 12 (card-list) (your feedback is welcome there).
The synopsis : good news, it’s already there 
Click on a poster : this opens a detailed panel with the synopsis, the date and the booking link. It does not appear directly under the thumbnail (the grid remains deliberately compact), but the content is there.
The size of the posters / the cut text : the grid rendering (size of the thumbnails, title on two lines) is managed by the core of Gladys, the integration has little control over it. It’s also a topic that I bring up in the evolution request above, as it goes hand in hand with the question of the number of films displayed.
Don’t hesitate if you have more feedback, it’s very useful 