In Configure→TabBar, it says "Starting with Qt 5.9, the next two options will have different affects." The correct text is "Starting with Qt 5.9, the next two options will have different effects." ("affects"→"effects").
Hello, this typo was already fixed, please see issue at phabricator: https://phabricator.kde.org/D13125
(In reply to Thomas Piekarski from comment #1) > Hello, > > this typo was already fixed, please see issue at phabricator: > https://phabricator.kde.org/D13125 Ah!—I mustn't have the latest update then.