At present when a Knob or slider is selected to Action Current Channel >Main>Send>x. The Control will disappear if a Channel/Mix does not have access to that SEND.
For example if 4 knobs are assigned with and action of Current Channel>Main>Send> 1 through 4 respectively and LR is selected only the Knobs for Send 1, 2 and 3 are left displayed. As the LR only has access to 3 sends (which ate MTX 1, 2 and 3).
However buttons and labels assigned to Sends outside 1 thru 3 remain visible - but the label just displays function i.e. Ch main send 4 xxxx.
This is inconstant