Cannot apply changes when enabling "Edit the system configuration of this display model"

[iamduvede]

I purchased BetterDisplay to get HiDPI Flexible Scaling since my office monitor is only 1080p. However, when I go and enable this setting, I get a red notification telling me to Apply or Undo the changes. Nothing happens when I click on Apply, but the Undo button works fine and undoes the changes I had just made.

BetterDisplay version 3.4.1 Build 38167
MacBook Pro 13-inch, M1, 2020
macOS Sequoia 15.3.2

[waydabber]

After you did the apply, you should have the resolution slider in the app menu have more options and also HiPDI option appear and work at 1080p in the menu.

But: the difference might not be that big, HiDPI creates a supersampling effect, but won't create more pixels, so I am not sure how much improvement you'll perceive in terms of clarity.

[iamduvede]

Nothing happens when I click Apply. The red box stays on screen and no changes get applied. For now I’ve been mirroring a 1080p virtual display to the monitor to help with the blurry text but I know this can cause performance issues where using Flexible Scaling does not.