The display of annotative objects is controlled by the current annotation scale of model space and the Annotation Scale property of a viewport. If you are in model space, make sure the Annotation Scale drop-down list on the status bar shows the scale you want annotative objects to be displayed at.
For layout viewports, select the viewport and, on the status bar, click the button to the right of the Viewport Scale drop-down list. Its tooltip reads, Annotation Scale is Not Equal to Viewport Scale and it sets the Viewport Scale property equal to the value of the Annotation Scale property for the selected layout viewport.