Ah!
New version solves the problem:
Release Updates
Version 2.0.0
- You can use now Mouse Wheel button to open file in a new pane
- There are now expand and collapse all buttons for folder view.
- There is an additional button to create a folder in the root folder
- Small style change for the line used for indenting children folders
- There is an option to select what should happen to the file deleted (system trash, obsidian trash etc.)
Version 1.8.9
- File can be dragged to Editor and link to file will be inserted
- File can be dragged into Folder view and dropped to move
- Folder can be dragged into another Folder
- Known Issue: drag needs to be initiated firstly out of the side pane. It doesn’t work if the drag happens only within the file tree pane.