I have been using Inoreader as my main feed reader for quite a while now after having tried feedly for a few years. I even upgraded to their Premium plan for the power user and additional newsletter limits.
I subscribe to a few newsletters as it is easier to get all the content in one place. There had been one rendering issue that I had been facing with Matt Levine’s Money Stuff newsletter ever since the recent update to Inoreader where the last few characters in each line would get cut off in the pop up reader view, like so:

I tried reaching out to support, but they were not able to do much. So, I did a bit of research and found that Inoreader has a custom CSS feature in its power user setting that some folks have used to personalise the interface. The newsletter contents were being rendered in an HTML table which I discovered by inspecting the source (hit F12 on the browser or go to the dev tools).
I did a bit of experimentation in the custom CSS settings, and found that setting the table width to 85% fixed the issue:
table {
width: 85%;
}
I’m sure this is a very obscure issue which is for users like me who have subscribed to a particular newsletter in a feed reader, but documenting it in case others face something similar.
You could of course just read the newsletter in your email inbox or through a service like NewsletterHunt, or just change the view to full article in Inoreader.