Please help us help you and fill where relevant:
LimeSurvey version: LimeSurvey Community Edition Version 6.6.3+240909 
Own server or LimeSurvey Cloud: Own server
Survey theme/template: irrelevant (but using Fruity TwentyThree ( fruity_twentythree )
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I want to implement what Google Form called 'Linear Scale' where it looks like this:

Is this good ot bad?
         1  2. 3 4  5
Bad   O O O O O Good

Where O = radio button.

I try to do it with '5 point choice' or 'Array with 5 points'.

Has anyone done it?  Ideally, I want to make it a 6 points or 8 points scale (or 3)

Please refer to the manual.

Array type question with Semantic Differential layout - www.limesurvey.org/manual/Question_type_-_Array/en

Thanks. This is more or less what I'm looking for.

In the doc, the labels on the left and right-aligned, and the labels on the right and left-aligned.

I tried to use this in the custom.css:

th.answertext {
text-align: right;
}

th.control-label{
text-align: right;
}

But it doesn't seem to work. Any idea?

In the doc, the labels on the left and right-aligned, and the labels on the right and left-aligned.

This is the default setting in all theme - except "fruity twentythree"
 
 

In my opinion this should be the same behaviour.
You may file a bug report.

In the meantime you may use this.
And you better add an additional class that only your desired arrays are affected, like and my "myarray" into "css classes" (where desired)
 
Joffm