How to play oppacity in Composite Mode 'Add'

Dear all,
Today, i always use Light Leaks (Film Burn) as my transition. But, sometimes my light leak are too heavy, i need to change oppacity of it to make it more artistic.
I see playing oppacity with Composite mode 'Add' doesn't work anymore. It changed the brightness rather than oppacity.
How to change this light leak oppacity?
Thanks.

Light Leak Transition 1.jpg (198.75 KiB) Viewed 289 times

Light Leak Transition 2 - Too heavy effect.jpg (259.39 KiB) Viewed 289 times

Light Leak Transition 3 - Play oppacity.jpg (232.96 KiB) Viewed 289 times

If you want a more subtle blend mode you can use Screen. This blendmode makes colors not exceed 1.0 and is overall softer. If you're not adding light in a linear space this typically looks nicer.

However, regarding Add, I'm not seeing this issue on my system when lowering opacity.
I'm on Resolve 18.1 build 16 Windows.

2023-01-28 14_47_55-2023-01-28 14_46_06-Window.jpg (189.1 KiB) Viewed 242 times

2023-01-28 14_47_31-2023-01-28 14_46_29-Window.jpg (184.56 KiB) Viewed 242 times

Thanks so much shebby,,,