LlSetSitText

Wiki description

Displays text rather than the default "Sit Here" in the right-click menu.

Text will only be displayed if set by a script calling this function in the root. If text is set by a script in a child the text will only be displayed after unlinking it or relinking it as the root. If either a child or the root is selected as an individual prim and right clicked, the text displayed will be the default even if a script in the root has set text. More simply - The text property displayed on right click will always be that of the root unless, right clicking a prim under individual edit when it will always be the LL default.
Note that like particles, and the other set text functions, all text set via llSetSitText becomes a property of a prim, not a script. For that reason, the text will remain if the script that set it is deactivated or even removed.
You have no control over the face, size or colour of the displayed text.
Text is limited to 9 characters.

default
{
    state_entry()
    {
        llSetSitText("Be Seated");
    }
}

There is no way to stop a pie menu from having a "Sit Here" space reserved on it. Although by setting the string to a space no text will be shown.

To remove custom text that you have placed there, set the text as an empty string like this: "".

default
{
    state_entry()
    {
        llSetSitText("");
    }
}

Upon your having done so, the text that appears will revert to "Sit Here."

SVC-4870: llSetSitText does not apply for child prims, only the main prims sit text gets displayed