In my 18.104.22.168 The Windows/Cascade,Tile ribbon item is missing and haven't found how to add it.
I take the opportunity to ask to Devolutions team if/when the feature to accomodate more sessions will be implemented.
Best regards and wishes for a Merry Christmas and Happy New Year.
Have tried Reset Layout and UI items missing / Unable to hide UI elements but without luck.
Unfortunately it's not only supported in the Classic UI. We have updated the third party to support the split panel (vertical or horizontal) but this was not compatible with the Tile and Cascade.
Sorry about that.