Hopefully the next version can add vertical labels

[WTepiphany]

Hopefully the next version can add vertical labels

[GitHubRulesOK]

"vertical labels" is not a PDF terminology it has annotations but they are not well suited to vertical writing as when PDF was invented was not the "American" way. Something like this ?

[WTepiphany]

I mean that switching the horizontal tab of a book can be changed to a vertical tab of a browser-like web page

[GitHubRulesOK]

that has been asked many times but PDF / MS applications are also preset for horizontal wording
browsers like those using SumatraPDF may have horizontal bookmarks but you can do similar with personal applications