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 viewports on a layout, select the viewport and click the Annotation Scale is Not Equal to Viewport Scale button to the of the Viewport Scale drop-down list on the status bar. Clicking Annotation Scale is Not Equal to Viewport Scale sets the Viewport Scale property equal to the value of the Annotation Scale property of the selected viewport.