I want to drag and drop my main branches anywhere on my mind map
To freely drag and drop your main branches anywhere on your mindmap, you will need to turn off Auto-layout.
To turn off Auto-Layout you need to go to open the Properties panel.
Step 1: Go to View > Panels > Properties.
Step 2: Once the properties panel is open click on the background of your mind map and then go to the Properties panel and click on the Branches tab.
Step 3: Here you will see an option for Auto-Layout. Uncheck this option and you will be able to drag and drop your branches anywhere on your mind map.