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We have an incidents dashboard that displays throughout the plant. Typically, there are no incidents, or one or two. Every now and again, there might be five or six. So I originally only allowed enough lines so that six (?) could display on the screen. But many incident descriptions would then get cut off, even though there was a ton of unused space on the screen.
I'm not recommending this, but I ended up making seven (?) different charts, each with a different number of lines displayed, and use a conditional show to only display the chart that will best display the data. It works pretty well in this case. Not ideally, but pretty well. Obviously it's a big maintenance headache if I need to make changes. What it won't work for is a more normal case, where you might have, say, hundreds of records with text, where each text record could be one to many lines.
I may have misunderstood your situation on first reading, though. You say that "In standard options I am only able to set 2 or more lines and that option locked to all shown expressions." I'm fiddling with a pivot table now, and the option, if I understand what you're talking about, is not locked. I am able to select it, and choose, say, 2 lines. It affects EVERY expression, so it isn't dynamic per expression, or per value of that expression, but I can at least select it. Assuming you're talking about the "wrap cell text" setting, anyway:
You are right. I only meant you chose it one time and it is fix for all of your lines/rows. I was talking about "Wrap Cell Text". Have some problems in explaining something in english 🙂 ! And naming these options, because Qlikview shows mine in german 
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Problem is, I have about 30 to 50 rows and they reach from 1 to 6 in height. So your solution would not work here. Unfortunately... Perhaps in other scenary... With thisone I have to wait Qliktech is fixing this issue.