Comment

After selecting text, click the Comment

button on the toolbar or press Ctrl + J.

Then, the selected text is commented.

If no text is selected, only the line at the cursor is commented.

Uncomment

After selecting commented text, click the Uncomment

button on the menu or press Ctrl + L.

If no text is selected, only the line at the cursor is uncommented.

To toggle comment, press Ctrl + K after selecting text.

If the selected text is plain text, the text is commented.
If the selected text is commented text, the text is uncommented.
If the selected text includes the plain text line and the commented text line, the text is commented.