Dolby Vision L2 Trim Controls
This article will help to answer the issue of not seeing Dolby Vision L2 trims being mapped to the Target Display monitor in DaVinci Resolve 16. While there are similarities with other platforms, you should see the appropriate product documentation for workflows related to your particular platform.
If you're using iCMU, make sure the second SDI channel of your I/O card is connected to the target monitor. And the 'Dual SDI output' option is enabled at the same time.
Trim Control option
Target Display Output and Trim Controls option should be set to match.