This thing work using opacity of the label ut ({Input ? "" : "<alpha=#00>"} "the thing like hud, status, display, etc”<alpha=#99>)

If you're talking about my work, here is what I made when I was talking about another topic before.
Since multiple Alpha tags are used for partial display switching, it is necessary to access all of them in order to turn the whole on / off.

hmmm. I tried everything, size, other stuff, and nothing works. Sorry.

@KDnotSpy
Ah yes.
Imagine activating HUD by camera toggle, so it will work (show up) only when certain camera is Active (Variable outputs).
And that's possible with just one more part (the camera; because cockpit part do NOT have that specific Variable Output).
Probably that is also simplier than adding switch with a variable...

@PlaneFlightX I am confused
Heres the build

@KDnotSpy Put it into Text.
Just in the beginning
*I'mnotPlaneFlightXyeti'mansweringquestionthatwasadressedtohim,hahalol.*
overcomplicating? nope
upd. imagine answering to a deleted comment. i'm slowpoke.

My solution:
Put ternary operators on every single <alpha> text format. That's what I plan on doing.

Okay, so what we do is first get the entire code of the HUD label.
For the purposes of this, I'm going to assume you have a switch writing to the variable HUDSwitch with the interactionType of Toggle
Replace HUDCode with the large mess of text that is the HUD.
<size={HUDSwitch = 1 ? 100 : 0}%>HUDCode
Try that. I'm not sure if it will work, but I'm pretty sure it will.

Imagine placing FT formulas into label like this:
<stuff>{ (clamp01(Activate8)=1) ? "PieceOfHUD" : "" }</stuff>

Now Get Real.
And Dew It!
Yes, You Can.
Make Your Dreams Come True!
Just Dew It!

making the alpha 0% on some action group, i guess... i dont know how to do xml

@PlaneFlightX Yes

Well, the simplest way to do it (that doesn't risk potentially interfering with any fancy FT bits in the HUD) is to just attach it to a really fast piston. That's what I did on my Firebird.

Do you want the HUD to be invisible when off and visible when on?