I expect there will be more improvements to the new editor in upcoming releases but for now...
In Mendix Studio Pro 10.6.x you can enable the old microflow editor.
1. Open the Edit menu and choose Preferences
2. Select the "New Features" tab
3. Check the "Enable switching to the classic version of the editor" option
4. Open a microflow, on the top right there will be a toggle to switch between classic and modern
Note that this option is removed starting with 10.7.