You created and applied a rule for a field or section, etc. to control the visibility property. However, even if the rule is returning TRUE value, the object is not visible.
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At runtime we combine the static value and the rule via logical AND. Once everything is done including e.g. the assignment of a dynamic rule you can simply "enable" this part of the screen by checking the "Set as Visible" checkbox.
After the rule has been applied, you need to deselect the box of visibility property.
Rule, Visibility Property. , KBA , AP-RC-UIF-FLX-FRW , UI Adaptation Framework , How To