Quickly Mark Topics
XMind 2020 lets you quickly mark main topics and subtopics as
Selecting the main topic/subtopic, you can quickly mark it in the Format panel. The same marked topics will have the exact same style.
Update Marked Topic Style
After you change the style of subtopic (topic shape, color, font and branch line, etc), you will see an Update in the upper-right corner of the Format panel.
Clicking on Update, you can choose to update the modifications to all subtopics or just to subtopics of the same level.
If you have purchased a subscription of XMind 2020, you can also customize quick style from Tools > Create/Customize Theme > Next.