One of the properties that should be exposed (and probably also having it’s default value changed to false), is the bConstrainAspectRatio on cinematic camera actors.
All the maps (including some by Epic itself) have issues with monitors with different aspect ratios due to that option being set automatically to true, and without the possibility of the map creator changing it to not constrain (keeping normal monitor ratio).
This leads to issues such as flickering UI (for example between 21:9 and 16:9), affecting cinematics, map interfaces (both passive/HUD and interactive/menus), and even fortnite social tab itself and settings screen.
On many cases, experienced creators uses the bConstrainAspectRatio=false on purpose to avoid these wrong/glitchy scenarios, or just to not clamp the camera on a running cinematic (to not show black bars/borders)…
This is a very basic feature, absolutely needed for cinematics, works fine without problems, but is not exposed, forcing creators to “hack” the workflow by editing the camera actor on a notepad to change this setting to a desired state (that imo, should even be the inverse by default for better compatibility)…