Refresh rate when using Max2 as external display

Hey there. When using the Max2 as an external display I need a full-display refresh to happen at least every ~5 seconds. The lowest refresh time I can see in the menu that is accessible in external display mode shows 5 minutes. How could this refresh rate be increased?

Pls update to the latest firmware V1.9.1 and check again, thank you.

OTA update process:

settings→about→system update→check update from cloud→update