Ooh... a switcher! :) You're my new favourite person! I, too, used to be a user of Sidenote, and I would also accidentally trigger the window by mistake. It is a fantastic application, though, and the developer has clearly put a lot of time and effort into it. Scribblet still has a long way to go!
Thank you for your kind comments about Scribblet, though. I'm really pleased to hear you find it so useful, and hopefully you’ll enjoy new versions in the future as well.
In regards to your comments about bolding... you should be able to do this. Command + B is the shortcut to bold any selected text. Alternatively, you can press the Font button on the toolbar to bring up the Font window to customise the text further.
Does this help? Please let me know if you're still having any problems.