You could do it with an SQL query:

DELETE FROM Ens_Util.LookupTable WHERE TableName = '<name of table>'

You can create the query either via the Management Console (System Explorer | SQL | Execute Query tab) or from the SQL Shell

JEFF>d $system.SQL.Shell()
SQL Command Line Shell
----------------------------------------------------
 
The command prefix is currently set to: <<nothing>>.
Enter q to quit, ? for help.
JEFF>>delete from Ens_Util.LookupTable where TableName = 'facLookup'
1.      delete from Ens_Util.LookupTable where TableName = 'facLookup'
 
3 Rows Affected
statement prepare time(s)/globals/lines/disk: 0.1893s/11322/125529/16ms
          execute time(s)/globals/lines/disk: 0.0021s/29/408/0ms
                          cached query class: %sqlcq.JEFF.cls27
---------------------------------------------------------------------------

As @Brian Schoen alluded to, $CHAR -- abbreviated to $C if you want to be one of the cool kids -- is what you need. $C(13,10) is the line-end sequence in Windows. $C(10) is Unix. $C(13), though, is old-school Macintosh*

* Also works for HL7 Segment delimiters

%SYS>d ##class(Config.Startup).Get(.Prop)

%SYS>w Prop("WebServerPort")
57772

The Inactivity Timeout is a fixed value, and you can't easily reset it for different times of the day. You can, however, fairly easily control which times of the day alerts are actually sent, based on a variety of criteria:

The TimeIsBetween() and DayIsAWeekDay() functions in the screenshot above are relatively simple custom methods in a class that extends Ens.Rule.FunctionSet, which makes them selectable in the rule editor's function editor dropdown. I wrote them simply for the improved readability they provide for the routing rule.

In the rule above, alerts for the HIE_ADT_out interface are sent only between 7am and 7pm to the Integration team; on weekdays only the help desk is included. Any that fall outside of that timeframe are discarded.

Is that screen shot from the Ensemble Message Viewer? If yes, than what you're seeing is Ensemble's visualization of an empty field/component/subcomponent/repetition. The tilde (~) character is the repetition delimiter at the field level; InterSystems uses the "·" character as an indicator that the repetition was left empty. There's no actual character there to split on, but you can certainly iterate through repetitions within OBX:5 and build a new message segment for each.

The DTL would be something like this:

OK, it's quick and dirty and I'm probably doing something that will make the old-timers here laugh hysterically, but it works. The caveats are:

• It only cares about word wrapping on the space character. Punctuation adjacent to non-space characters will stay with the adjacent characters.
• It totally ignores things like \.br\ tags. they're just text as far as it's concerned.
• It returns a $LIST, where each list element is a line of text from the source string, no longer than the width specified. You can iterate through it with $LISTNEXT or $LISTGET and populate your OBX segments, but you'll probably have to do that in a CODE rule.

So anyway ...

ClassMethod WordWrap(pTxt As %String, pWidth As %Integer) As %List
{
    If $LENGTH(pTxt) > pWidth
    {
        set tLine = ""
        Set tCnt = 0
        Set tWordList = $LFS(pTxt," ")
        Set tListLen  = $LISTLENGTH(tWordList)
        Set tWordPtr = 0
        Set tWordCur = ""
        While $LISTNEXT(tWordList,tWordPtr,tWordCur)
        {
            If $LENGTH(tLine_tWordCur) > pWidth
            {
                Set $LIST(tList,*+1) = $ZSTRIP(tLine,">W")
                Set tLine = tWordCur_" "
                Set tLastCnt = tCnt
            }
            Else
            {
                Set tLine = tLine_tWordCur_" "
            }
            Set tCnt = tCnt + 1
        }
    }
    Else
    {
 	Set tList = $LB(pTxt)
	Set (tLastCnt,tListLen) = 0
    }
    If tLastCnt < tListLen
    {
         Set $LIST(tList,*+1) = $LTS($LIST(tWordList,tLastCnt + 1,tListLen)," ")
    }
    Return tList
}

Have fun!