How do I indent multiple lines at once in Notepad++?

Solution 1:

The problem was with the QuickText plugin. After removing it, indent worked as normal.

Solution 2:

The problem with the new version of QuickText seems to be that it is set to react to the TAB key. Previously it was set to use CTRL-ENTER. If you change the key combination in the shortcut mapper then your TAB key should start working again, and QuickText should also work (with whatever new key you've assigned).

Solution 3:

Capslock + Tab to indent multiple lines at once. Highlight the text first.