How can I format an inline code in Confluence like this? I mean, not a separate code block, but just inline classname, for example.
As of Confluence 4 and above, typing two curly brackets does not work.
You now need to select Monospace font. Highlight the text you want to change and:
Windows: Ctrl + Shift + M
Mac: Command + Shift + M
Alternatively, you can type a backtick (`) and Confluence will format everything until you type another backtick
Alternatively, next to the bold and italic options, you can click the "more" drop down and select Monospace: