I basically always prefer to use SQL instead of the query builder when creating/modifying a layer's definition query, but as far as I can tell, there is no setting in the ArcGIS Pro options to turn off the query builder and make SQL the default. That means that it takes 2 mouse clicks to switch to SQL mode:
1. Click 'Edit'.
2. Click the SQL slider.
It would be great if clicking 'Definition Query' in the layer properties would open the SQL pane with no extra clicks. Am I missing the setting for this?
