Joplin version: 1.0.179
OS: opensuse leap 15.1
It looks like you’re not using a monospace font, unfortunately the current editor requires the font (just the editor font) to be monospace. There is a warning just below where you would have changed that font.
Eventually Joplin will move to a new editor, but until then you’ll have to deal with a monospace font.
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Thanks. It works.