Hide notes in current document
In the top right corner of the document, click on the eye icon to open the view filters popup. Select "Hide" to always hide notes in the current document.
You can also choose to only see the first line of notes by choosing the "1st line" option.
Hide checked items in all documents by default
Click the gear icon on the top right corner of the app to open settings. Under the Preference tab, you can find an option called "Notes" under "Appearance". Choose "Hide" from the dropdown menu. You can also choose to only see the first line of notes by choosing the "1st line" option.
You can override this setting on a per-document basis using the method mentioned in the previous section.