Reproduction steps:
1. Open the attached “IN-99245 HDR in Scene view issue (3D URP).zip“ project (link in the internal comments)
2. Open the “SampleScene”
3. Go to Edit > Project Settings… > Player and make sure that the “Allow HDR Display Output” and “Use HDR Display Output” options are enabled, and that “Direct3D12” is selected as the Graphics API
4. Observe the “Cube” GameObject in the Game view
5. Observe the “Cube” GameObject in the Scene view from the same distance and angle as the “Main Camera”

Expected result (URP): The “Cube” GameObject might have a yellowish/orange tint and is very bright, and looks identical both in the Scene view and the Game view when looking at both views side-by-side (results will look different on different displays, see the “Notes” section for more details)
Actual result (URP): The “Cube” GameObject appears white (neutral in brightness, might appear slightly greyish depending on the display), and looks different in the Scene view and the Game view when looking at both views side-by-side

Reproducible with: 2021.3.51f1, 2022.3.62f1, 6000.0.49f1, 6000.1.2f1, 6000.2.0b1

Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested

Tested on: Alienware m15 R3 with a 4k HDR OLED screen @ 60Hz (more detailed specs in the internal comments)

Notes:
- Switching from the Scene view to the Game view turns the Game view into SDR as well (maximising the Game view, entering Play mode or restarting the Editor brings the HDR in the Game view back temporarily until this is repeated)
- Keeping the Game view visible at all times (for example, side-by-side next to the Scene view) stops the above-mentioned issue with the Game view from reproducing until the Game view becomes hidden again by the Scene view
- Depending on the capabilities and calibration of the display, and Windows Display settings, it might be difficult to see the difference between HDR and SDR content on the screen and compare the actual and expected results. If in such a scenario, try going to Windows Settings > System > Display > HDR and adjusting the “HDR content brightness”/”SDR content brightness” slider (different displays will have the former or the latter). Observe the Game view and the Scene view simultaneously, side-by-side, and one or the other will not react to the change (depending on which slider you have). This indicates that the issue reproduces, since both views should look identical and react identically to that slider change
- URP and HDRP produce different-looking results, but the effect, in terms of brightness, is very similar (see the attached screenshots in the internal comments)
- Not reproducible with the Built-in Render Pipeline (both the Scene view and the Game view are rendered in HDR consistently)
- Not reproducible in the Player
- Reproducible in a new project
- Could not test with the “Vulkan” Graphics API due to a “Swap chain with supported HDR formats not found. Using supported SDR swap chain format” error
- Could not test with the “Direct3D11” Graphics API as it only supports HDR in the Player