Csdrhrt

I'm making a map of North Dakota and trying to label the counties, but one of the names (Golden Valley) is extremely long in a very tall county. I don't want to turn the label vertically, but would rather put 'Golden Valley' on two lines so it will fit.

Is it possible to edit only that label so that it is on two lines? And how?

You can use wordwrap() function with condition in the expression to wrap only 'Golden Valley' when defining the field to use in Label with:

Here is the expression to use:

Case

When  "CountyNM" =  'Golden Valley' Then wordwrap("CountyNM",6)

else "CountyNM"

End 

Where "CountyNM" is the field name in this example. You need to change it based on the field name you are using.

Here is the result:

Set the labeling type to rule-based labeling,

Then create a rule which filters out Golden Valley, label it with the expression 'GoldennValley'. "n" is a line break operator so it forces the next part of the string on to the next line.

Then create a second rule with the filter ELSE, this will include all the other labels.

Or there is the third option: In data table you can add any symbol between respective words (in my example it is a symbol ►_◄). And everywhere when there will be ►_◄ it will wrap. In this case you won't need to make any rule-based labels or to add new names in an expression.

But remember this symbol will stay there, and you must do the same action in labels (wrap on character) in every new project using this data.