It'd be neat if it allowed multiple windows. This would also make it more like real-world post-it notes. I'm afraid I'll forget that there are several notes when they're just hidden in these invisible tabs that you can cycle through...
It has, perhaps propose something to create new notes/note groups more obvious. Currently: right click the panel plugin/systray icon, go into submenu Go => Add a new group. Inside a window (which I turned into "note groups"), right click the window title (or click the top left icon), and same, select Go => Add a new group.
Tabs? You can show them. Open the properties/settings dialog and tweak the options.
Ah, ok, I was blind about the tabs settings. Sorry for the fuss. Adding a new group doesn't seem to be possible here through the panel plugin context menu (v1.7.2). I have to right-click the window title bar, then the Go submenu has the entry to create a new group (which I must have overlooked too... ugh) Hm, I'm not sure how to make this more intuitive, except maybe to also add it to the panel plugin context list. If I come up with a better idea, I'll let you know.
My other 2 cents are that "Go" is not the best name for the submenu. Maybe "Windows" or "Management" would be other options. Since the menu has bene called Go for a while probably, I'd understand if you want to keep it that way of course.
Renamed to Groups in git 0cde4e4..22040ea.
Btw, I also plan to highlight the "menu" button on the left (the actual note icon) on mouse hover.
I think that would be very helpful, great idea.