The top menu is missing some features.

File could contain the following entries:
Edit could also contain the following entries:
Help could also contain the following entries:
also: version
Also suggest to add "Preferences" to the menu, in addition to its button under the top-menu. I understand it'd be a duplicate, but usually users look for Preferences in the menu first. Not a big deal to have a duplicate I guess, if that's make the UX a little more convenient.
In small screens, it'd be helpful to be able to close/fold the list of notes to the left side. This feature was available in the legacy app. Folders were given a color, so one could recognize and switch to the needed folder by color. This feature could be added as well, or just closing and opening the notes pane would be good.
Those additions would indeed be great. They are addressed in separate issues: #333 and #334. Give those a 馃憤
After #333 is merged we can also add it to the View menu.
Most helpful comment
also: version