labelling line with an attribute, but to one side of the line (direction of digitization)

[RamB]

Hi,

I am looking for a way to label a polyline layer. The label is an attribute of this layer. But I want to place this label to the left of the line. So if another line is digitized in the other direction, the lable to be placed on the other side (its own left). 

I have looked at the help. It seems possible with label position> orientation. But my orientation and its dropdown are  greyed out I do not know why. 

Can someone suggest how this works ? I am on ArcGIS Pro 3.0.2

Thanks

[DanPatterson]

Are you using the Maplex labelling engine?

Specify a line label position—ArcGIS Pro | Documentation

Label with the Maplex Label Engine—ArcGIS Pro | Documentation

[RamB]

Thank you Dan, I was already using maplex engine.

I have read many help pages and your pages and was able to correct this. A restart of arcgis pro opened options that were inactive before. A bit wierd I know (could have been something else I changed).