Tvheadend

Hello,

I am running tvheadend in a docker container using linuxserver/tvheadend:latest.
The version is 4.3

I am trying to create a transcoding profile that serves the content with a 720p resolution.
When I try to add the profile there is no input where the resolution can be set (I added a scrrenshot of the popup).

What am I missinng ?

Thanks!