The first provides the best consistency, e.g. same settings/cons across al windows
The latter the best customizability, e.g. app specific content in the bar, like tabs. In this case it is up to the app (or the library it uses for title bar) to mimic the system title bar.
From the screenshots its looks as if Brave has better emulation of system title bar when running in Cinnamon than it has on Plasma.
Could be something that can be fixed on the app-level, maybe a theme or style setting
You could try a wider search, e.g. looking for tips with “chrome” or “chromium” as this might affect all these browsers equally.
Technically the title bar is a so-called “window decoration” so this might also be something to try explicitly.
Some applications (not sure this applies here) use libdecor to render their decorations and it might have have external settings or evironment variable to affect how it is drawing things.
You could also check with the Fedora forum.
The might not install the Plasma support by default, etc.
KDE handles titlebars differently than Cinnamon. What you’re looking for is the “Tabs on Titlebar” feature in Brave, but with KDE’s window decorations, it doesn’t always play nice.
Try going to brave://settings/appearance and toggle off “Use system title bar and borders” first, then enable “Tabs on title bar”. If that doesn’t work, you might need to disable KDE’s native titlebar entirely using window rule settings.
Alternatively, right-click on Brave’s titlebar → More Actions → Special Window Settings → Add Property → Titlebar → Force “No Titlebar”. That should let Brave handle its own titlebar with tabs integrated.
