Header capsule (also the library header) 920x430: big title
Valve: a legible logo filling at least a third.
Your rule applied: the small title wherever Steam allows it, the big one only where Steam's guidelines require a readable title. Steam's upload confirmations ask every capsule (header, main, vertical, library, the library header) for a legible logo filling at least a third, and the small capsule for a logo nearly filling it, so those take the big title; the event images take the small one; the hero, page background and icons take none. A24 is out. Where a slot still has more than one candidate (vertical, library), each is shown.
Valve: a legible logo filling at least a third.
Valve: the logo nearly fills it.
Valve: as the header.
Valve: as the header.
Valve: as the header ("graphically centered"; Steam shows it at 300x450).
Required for every announcement; artwork + branding, Steam adds the name and icon beside it.
Suggested, top of the event page.
Behind the store page; Steam tints it.
No words; also 184x184 (JPG) for the app icon.
The hero carries no words; Steam lays the transparent logo over it (placement bottom-left here). S15 cut to the hero's shape is the one hero left standing (A10 and the flat A24 are out); it needs your word.
The gem back on the frame's lower left; the five orbs loose on the knot at the bottom, under him. Its library capsule above puts the painting on the extended canvas (round 101) so the title sits under the frame.
