Multiple Display Best Practice

I develop a VR application. It has a full screen GUI on the monitor. I have 2 cameras, one for VR, one for GUI/Canvas. I use target display: Display for both. On game view I see GUI using rendering priority. After I started to use Unity 2022 instead of 2021, I have glitch problem. I guess it is because of render sync. VR headset and monitor has different refresh rates 90 Hz / 144 Hz. When I set VSync enable on Game view resolution dropdown, It helps for the glitch but still there is some glitch. What is the best practice for my case? Using 2 display targets? Can I set vsync for a specific display target?

I have 2 monitors with different refresh rate 144 Hz / 60 Hz. I have HTC Vive Pro Eye with refresh rate 90 Hz.

What is ‘the glitch’?
What was it before and what does it do now?