Visualizations are responsive from Spotfire 7.13 onwards except Text area. You may use a Map Chart Visualization as a workaround as described below:
1) Add a Map chart visualization i.e. Open Spotfire Analyst > Load the data/ analysis file > Click on Map Visualization.
2) Right click on it > Properties. Select the 'Layers' section and disable(uncheck) all the visible layers.
3) Click on 'Add' button > Select 'Image Layer'.
4) Inside the 'Data' tab/option, add the image by making use of 'Browse' button present in the section-'Background image file'.