Editor Mouse Sensitivity

General Issues and Bug Reporting (Unreal Engine)
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Summary

[Mac] Mouse sensitivity/acceleration regression across Viewport, PIE, and Event Graph panning since UE 5.8

What Type of Bug are you experiencing?

Editor

Steps to Reproduce

Launch UE 5.8 Editor on macOS

  1. Open any project, open a level in the Level Editor
    In the viewport, right-click and drag to look around - note sensitivity/acceleration feel
  2. Go to Edit → Editor Preferences → Level Editor → Viewports → Mouse Sensitivity, lower the value, confirm viewport look/aim and actor drag now feel corrected
  3. Click Play (PIE) and use mouse look - observe sensitivity is still elevated/accelerated despite the setting change in step 4
  4. Open any Blueprint, go to the Event Graph, and pan the graph with held right click, observe panning is also elevated/accelerated and unaffected by the Viewports Mouse Sensitivity setting

Expected Result

Mouse sensitivity should not be higher than experience on other platforms like Win64, requiring platform specific Mouse delta modifiers for in-game look aim speeds to feel similar.

Observed Result

Mouse sensitivity has greatly increased between the 5.7 and 5.8 editors on the MacOS platform, where side by side editors can be observed inconsistant.

Affects Versions

5.8

Platform(s)

Mac

3 Likes
2

A commit to the Unreal Engine (4df54386988ae493a92f283532d31fadf2cbfdcc)
focussed on [Mac] high-precision mouse movement implementation with the GCMouse-based

I may not be a os level developer, but I did modify this change, and decreased the mouse delta raw values by 4x to restore mouse sensitivity expectations.

This fix requires Unreal Engine Source Build.

In method FAppleMouseController::DispatchMovementUpdates()

At line 160:

FVector2D RawMovementDelta(CurrentMovementState.MouseDeltaX.exchange(0.0f), CurrentMovementState.MouseDeltaY.exchange(0.0f));
RawMovementDelta *= 0.25f; //Reduce sensitivity by 4x
3

Mouse hyper sensitivity for MacOS still present in 5.8.3 release.

Can anyone else confirm the Mouse input feels 4x higher in ViewPort, PIE, and EventGraph Panning?
Or I’m having an isolated incident with my choice of LogiTech mice.

Current Specs
MacOS27
Macbook Pro M4 Max
External Widescreen Dell Monitor
LogiTech MX Master 4

4

Same here. My mouse was working perfectly fine in 5.7, but since 5.8 it’s almost unusable due to the extreme high sensitivity, especially when panning around in EventGraph. Tried both a Logitech mouse and an Apple Magic Mouse, and this one is even worse. This behavior wasn’t present in previous UE versions.

Specs
UE 5.8.3
macOS 26.7
Mac Studio M1 Max
Apple Studio Display

1 Like