To reproduce:
1. Open attached project
2. Build and run to Android device
3. Try to change the resolutionScalingFixedDPIFactor with the UI Slider

Actual result: ResolutionScalingFixedDPIFactor does not apply its changes
Expected result: ResolutionScalingFixedDPIFactor should apply its changes when the scale is moved

Reproduced with:2017.4.28f1; 2018.4.1f1; 2019.3.0a5

Tested with:
VLNQA00035, Motorola DROID MAXX 2 (XT1021), Android 4.4.4, CPU: NOT FOUND, GPU: Adreno (TM) 305
VLNQA00270, Samsung Galaxy S10e (SM-G970F), Android 9, CPU: Exynos 9 9820, GPU: Mali-G76
VLNQA00124, Google Pixel 2 XL (Pixel 2 XL), Android 9, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540

Note: If you press the overview button to set the app into the background and select the app again, resolution changes are applied correctly