Unfortunately MindManager is not fully compatible with the Arabic language as an input language, but there is a workaround:
MindManager supports unicode characters that are written left to right. The software supports Hebrew and Arabic characters, but it does not support the right to left inputting method.
One workaround that has been reported to work however is placing a blank space before all lines of text on the topic. The text direction should display correctly. However, if the language is changed on a different topic branch, this workaround may not work.