If you are a Basic or Pro subscriber you can export your maps. To export a map click on the button with the down arrow in the top right corner of the map environment.
You will see the Preview screen appear, where you can configure the print options:
Node layout: mind map, tree, two-level tree, compact.
Sheet orientation: vertical or horizontal.
Map style: nodes with white background, nodes with writing only.
Before exporting, you can move the nodes of your map freely in the sheet by simply clicking and dragging. By occupying the sheet space better, the map will be more "zoomed in" and readable.
Once you are satisfied with the preview, click on "Download" at the bottom and choose whether to export to PDF or image.
Please note: increasing the text size does not directly affect the readability of the map.