I found if want to add vertial line in scatter plot (by property->Lines & Curves->Add->Vertical Line), the X axis must be continuous nteger, if the X axis is not integer or contino

I found if want to add vertial line in scatter plot (by property->Lines & Curves->Add->Vertical Line), the X axis must be continuous nteger, if the X axis is not integer or continous integer, the Vertical Line option will become disabled.

Why can't add vertical line for categorical X axis? Is there any other way to draw vertial line in scatter plot?

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