You can set the topic size and margins for individual topics using the Format Topic dialog launcher. You can only set these options in Map View.
Select the topic(s).
On the Format tab, click the Topics dialog launcher.
On the Size and Margins tab, choose settings to apply to a standard topic shape. If a Custom shape is used, you'll see a preview image where you can set the text area. Padding applies to topics with images. The measurement units used (in or mm) are set using MindManager's General options.
Some experimentation may be required to get just the right "look" for your map - click Apply to see how your settings will look without leaving the dialog.
On any of the tabs, use the Style button if you wish to:
Save as New Style Default: Save all the topic's format settings as the automatic style for topics of the same type at this level. The settings become part of the current map's style. All existing topics at this level assume these attributes (unless they have been individually formatted), as will any new topics you create. You can save these new settings as a Map Style that you can re-use on other maps. You can see these new attributes in the Modify Style view.
Reset to Style Default: Reset the topic to the automatic formatting of the current style.