thank you for the suggestion. You can increase the font size of the tree and the lists using View -> Options -> User Interface to make it easier for touch displays.
One option but the tree view is still difficult to navigate. There would be plenty of space in the main window for thumbnails. An extra tab like Dashboard/Overview or a third toggle option for these two would be a much better solution.
It doesn't even have to be a live thumbnail, a generic icon is enough.
Is it possible to have a thumbnail overview of the configured (not the active!) connections in the main window? For example if you select a folder in the left navigation with 10 connections, display thumbnails for each connection in the main window.
This would increase usability on touch displays a lot. The tree navigation is way too small for touch navigation.