Hello,
I am having an issue in the Unified Inteface while Creating Service Activity, On Create form i am not getting "Start Time" and "End Time" populated by default.

When I try refreshing the page through my browser window, It takes me back to the legacy form and then "Start time" and "End Time" gets populated by itself. THERE IS NO JAVASCRIPT CODE THAT CAN WRITE IT.
here is an example.

No service has been selected on the record and the URL has APPID but it still goes back to the legacy form while it has been turned off.
QUESTIONS:
1) Is there a way to prevent it from going back to the legacy interface?
2) how does these "start Time" "end Time" gets populated by default without having any service selected on the form? (there is no Javascript on the form that does that)
3) why doesn't it show on the unified interface but on the legacy one?
please help.
Thank you,