On my Chromebook, I’m unable to see the preview before I post. This is even true when I shrink the font,
This is likely just a combination of by HD resolution and my font sizing. It must be based on the system settings rather than current screen zoom.
It works fine on another Chromebook for FHD. It probably needs a bug report with Discourse.
Just an FYI as others may see this too…
On mobile the little screen icon in the bottom right corner of the composer is the ‘show preview’ button.
You’ll also have a much better experience if you change to the desktop mode via the “Request Desktop Site” option in your browser settings.
If you can’t see a preview when in desktop mode, there is a double arrow icon at the bottom to show it.