Maybe I'm doing it wrong but dragging windows to desktop/screen edge does nothing on my system. I have quite freshly installed Solus with all the updates installed running on Thinkpad X61s. I have tried with multiple windows, maximized windows etc. Do I have to hold some key down?
BR,
M.
Edit: Tried disabling and enabling the tiling option in Budgie settings, then rebooted, and it seems most windows now tile to sides when dragged to edges! Great! It seems at least 'Files', 'System Monitor', 'Settings' and 'Photos' doesn't tile, there might be others too.